https://gist.github.com/bgoonz/ebe842b651bba237d70bccfa5a7b5a75
Your computer has something called random access memory (RAM). Sometimes, people say "memory" when referring to RAM.
Things like videos and files are stored on a disc, not in RAM.
RAM is faster than disc storage, but there isn't as much space available.
Disc storage has more space, but it is slower.