ELI5: Explain Like I'm 5

Basename

Have you ever played with those nesting dolls, where there is a big doll and inside it there is a smaller doll, and inside that one there is an even smaller doll, and so on? Well, imagine you have a really long name for a file, like "mydocumenttextfile.txt". The "basename" is like the biggest nesting doll, it's the name of the file without any of the extra parts like ".txt". It's like if you just kept taking off the outside part of the nesting doll until you got to the biggest one. So when you use the "basename" command on your computer, it just gives you the name of the file without anything extra.
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