Yacc

Okay kiddo, have you ever played with Legos? You can use different pieces to build a bigger creation. Well, YACC is kind of like Legos for computer programs. It's a tool that helps programmers put together a program by assembling little pieces of code, or "tokens," in a specific order.

But, instead of just building a castle or spaceship with Legos, programmers use YACC to build something much more complex, like a programming language. Just like how you use certain Legos for specific parts of your creation, YACC uses certain tokens for specific parts of the program.

Imagine building a robot with Legos. You might use certain Legos for the robot's head, arms, legs, etc. YACC works in a similar way, but instead of using Legos, it receives a list of "rules" that tell it which tokens to use in each part of the program. These rules are written in a special language called "grammar."

Once YACC has all the rules, it can take input, or code, and analyze it. By comparing the input to the rules it knows, YACC can figure out how the code should be put together, or "parsed." This is important because if the code isn't written correctly, the program won't work.

So, in summary, YACC is a tool that helps programmers put together a program by assembling little pieces of code in a specific order, kind of like Legos. It does this by using a set of rules written in a special language, or "grammar," to parse and analyze the code.