A digital footprint is a record of what you do online, like the websites you visit, things you search for, or the things you post on social media. Just like your real-life footprints leave a record of where you've been, your digital footprint leaves a record of everywhere you go online. It's like leaving a mark behind every time you do something online – so it's important to think about what sort of mark you're making and if it's something you want other people to see.