Over time memories build up in your computer, it keeps remembering things it doesn’t need to, making the room to remember new things lower. With that lower room for memories, new programs and files have a harder time finding room for themselves, and so it takes more time to put them somewhere and find them again.
Over time this has gotten better, especially now that we have gigabytes of RAM at our disposal, but it’s still an issue that can and does occur on modern systems, too. I’ve mostly seen it happen on Windows machines, but I’m 100% sure that Macs are affected by it, too.
Defrag is kinda like the memory thing but on your hard drive rather than RAM. As you use your computer things build up in RAM that don’t need to be, and on your HDD as you delete things some things stay in place when they could be moved back to create more sequential room so new programs and their files can live as close together as possible
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