Every slot has an address

RAM is not really an open surface. Picture a very long row of numbered slots.

Each number is an address. Storing information means placing a bit pattern into one or more slots. Finding it again means going to the right address and reading what is there.

The phrase random access does not mean the computer chooses randomly. It means the processor can jump straight to a particular address without reading every earlier slot first.

It is like opening a book at page 300 instead of turning every page from the beginning.