Combinatory Categorial Grammar (CCG) is a language that helps computer scientists understand how words in a language fit together. It is like a set of rules that helps the computer figure out what words mean and how they connect with one another to make sense. To understand CCG, think of a game where you have to make as many words as possible out of a bunch of letters. This is a bit like how CCG works, but with words instead of letters and instead of making words, CCG helps the computer figure out how the words are connected.