On a fundamental level, computer are device that perform mathematical calculations and operations very quickly.
Though computers have improved a lot since being invented and can a lot more than just mathematics.
Modern computers allows you to access the largest source of information in the world, the internet.
With access to the internet you can access every photo, video and song that’s been uploaded to the internet amongst many other things.
To put the scale of the internet into perspective. At the time of writing this the average number of photos uploaded to the internet every day is 1.8 billion and 24,000 days worth of videos is uploaded to YouTube everyday, and that’s only the tip of the iceberg.