Here's a breakdown:
* Grammar: The set of rules that govern how words are used in a language to form meaningful sentences. These rules cover things like word order, verb conjugation, punctuation, and more.
* Grammatical: A sentence, phrase, or word is considered grammatical when it follows these rules.
For example:
* "The cat sat on the mat." is a grammatical sentence because it follows the rules of English grammar.
* "Cat the sat on mat the." is ungrammatical because it does not follow the rules of word order in English.
So, "grammatical" essentially means "correct in terms of grammar."