Most computers these days come with an internal SSD, which is very fast and is the reason your PC starts up much more quickly than the one you had ten years ago.
The only problem with it is that, unless you’ve splurged on an exceptionally expensive machine like one of the top-end MacBook Pro laptops, the SSD is quite small, and if you’re in the habit of taking a lot of photos or video, or perhaps downloading a lot of games, then you’ll soon run out of space. Enter the external hard drive.
