When you order a meal on Just Eat, or select a film on Netflix, you are interacting with apps and websites that are collectively known as the ‘front end’. But these websites and apps are just the tip of the iceberg. They can only work by communicating with a whole bunch of other systems which live on the cloud, rather than on your phone or TV. These other systems are collectively known as the back end. This is where the heavy lifting typically gets done, in terms of data storage, data processing, machine learning, and countless other behind the scenes processes that serve the slick front end apps that everyone is familiar with.