Grammar
Grammar is a collection of the rules about how to speak and write well in a language.
Spanish grammar is different from
English, they have different rules, for example in English we say "I like fast cars" but in Spanish the order of the words changes according to Spanish language rules of grammar and it's written as "Me gustan los carros rapidos". Not only is
vocabulary, the words, spelled differently, but the order of the words is different because of the different rules of grammar in the two languages.