What Is Big Data? A Layperson's Guide

Written by Coursera Staff • Updated on

Learn what big data is, common applications in a wide variety of industries, top desired skills, and what types of careers you can find in this industry.

[Featured image] Woman in computer data lab

Big data refers to large data sets that can be studied to reveal patterns, trends, and associations. The vast amount of data collection avenues means that data can now come in larger quantities, be gathered much more quickly, and exist in a greater variety of formats than ever before. This new, larger, and more complex data is collectively called big data.

What makes big data “big?

Though no threshold separates big data from traditional data, big data is generally considered to be “big” because it cannot be processed effectively and quickly enough by older data analysis tools.


The three Vs of big data

Big data is broadly defined by the three Vs.: volume, velocity, and variety.

  • Volume refers to the amount of data. Big data deals with high volumes of data.

  • Velocity refers to the rate at which the data is received. Big data streams at a high velocity, often streaming directly into memory instead of being stored on a disk.

  • Variety refers to the wide range of data formats. Big data may be structured, semi-structured, or unstructured and can present as numbers, text, images, audio, and more.

Companies that process big data may focus on other Vs as well, such as value, veracity, and variability.

What’s driving big data growth?

Emerging information technology has allowed data to be collected, stored, and analysed at unprecedented scales. The internet continues to be adopted by new users in the UK and across the globe, and developing technologies have allowed internet integration into many different products, creating numerous new sources of data. The millions of people watching Netflix, using Google, or buying products online daily contribute to the increasing volume and sophistication of big data.

Examples of big data:

  • Smart (Internet of Things) devices: A connection to the internet enables companies to collect data through devices like smart home systems, robotic vacuum cleaners, smart TVs, mobile devices, and wearable fitness trackers that log files.

  • Social media: Likes, shares, posts, comments, how long you spend looking at a post—all of this information is considered insightful data about people’s behaviour, sentiment, and preferences.

  • Websites: Companies or other website owners can track page visits, general locations of visitors, how long audiences spend on a page, the most frequently clicked links, and cursor movement.

  • Business transactions: Data can come from customers purchasing products online and in person. Price, time of purchase, payment methods, and other details can inform a business about customer demand for their products.

  • Machinery: Even without an internet connection, machines like road cameras, sensors, and medical equipment can record information.

  • Health care: The health care system is full of data. Data analysts can use aggregated information on health care records, insurance, and patient summaries to drive new insights and enhance patient care.

  • Government: Local and national governments can use data from many sources—auto traffic information, agricultural yields, weather tracking systems, and demographic information from censuses, to name a few—to make policy decisions.

How is big data used?

Big data can be used by almost any entity to gain valuable insights and make decisions about their operations. A business, for example, can analyse the data they collect to understand customer preferences better and devise impactful business strategies.

Big data in health care systems can be used to find common symptoms of diseases or decide how much staff to put on a hospital floor at any given time. Governments may use traffic data to plan new roads or track crime rates or terrorism risks to adjust their response accordingly.

Data analysts and other professionals who work with big data may use the following tools and methods:

Predictive analytics: Analysts can use data to predict the likelihood of events or trends in the future by using predictive models and machine learning technology.

Real-time analytics: Real-time analytics is the process of analysing and using data the moment it enters a database to make decisions quickly, such as when a banking system flags a payment as potentially fraudulent when it is made out of the country. 

Data mining: Data mining refers to a process that combs through vast amounts of data to find patterns, trends, and correlations. Finding relationships between data points is crucial in helping organisations make decisions.

Machine learning: Machine learning—a form of artificial intelligence that learns and improves itself continuously—helps predict trends and find patterns in large data sets. Machine learning can be useful in adapting to new data influxes.

Deep learning: Deep learning is a subset of machine learning based on artificial neural networks and mimics the human brain's learning process. Deep learning is often used in speech and text recognition and computer vision technology.

Data warehouses: Data warehouses store massive amounts of historical data. The data is typically cleaned and organised and can be accessed later to be analysed.

Hadoop: Hadoop is a software framework used to store and process vast amounts of data that can work across several clusters of computers. Hadoop’s capacity to be scaled easily and ability to store various types of data at once have made it the go-to platform for processing big data.

Apache Spark: Apache Spark is a software framework that combines data analysis with artificial intelligence. It can perform analyses on large data sets more quickly in many cases than Hadoop.

Big data careers

Data-related professions—data analysts and scientists, AI and machine learning specialists, and big data specialists—took the top three positions in the World Economic Forum’s list of top job roles with increasing demand across industries in 2020 [1]. Here’s a closer look at the jobs that use big data in different capacities. 

Data analyst: A data analyst works to gather, clean, and interpret data and create data models. Data analysts can work in various industries, including business, science, and health care.

Data engineer: Data engineers work to create and maintain data infrastructure. This can include data warehouses, data pipelines, and other forms of organising data that analysts can use to make predictions or other interpretations. Big data engineers do this with software that can manoeuvre large volumes of data.

Data scientist: A data scientist generally uses mathematical or statistical knowledge to build algorithms, models, and other analytical tools to help organise and interpret data. 

Business intelligence analyst: Business intelligence analysts parse business data like sales information or customer engagement metrics to form actionable insights into how a business is performing. 

Operations analyst: Operations analysts gather data about operational issues in businesses or other organisations. Operations analysts can use data to find business insights and solutions to issues in production, staffing, or any other related aspect.

Marketing analyst: Marketing researchers or analysts harvest information about current or potential customers, market conditions, or competitor activities. The data collected is then used to understand how a business can respond through marketing tactics or product adjustments.

Learn how to use big data

Developing skills in big data has the potential to open career opportunities in many industries. Incorporating big data into your career can bring fresh insights into your work, and data will likely only grow in importance. 

To start, consider getting a crash course on the basics and add a relevant certificate to your resume by completing the Google Data Analytics Professional Certificate on Coursera. Coursera hosts many relevant courses to help you launch your career, and completing this Professional Certificate can provide you with a solid foundation to launch into your next exciting steps toward a career in big data.

Article sources

  1. World Economic Forum. "The Future of Jobs Report 2020, http://www3.weforum.org/docs/WEF_Future_of_Jobs_2020.pdf." Accessed August 16, 2023.

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