Punctuation allows writing to be easily readable and understandable. There are various types of punctuation marks including periods, commas, colons, semicolons, question marks, exclamation points, quotation marks, parentheses, apostrophes, hyphens, and ellipses. Each punctuation mark has specific rules for its use, such as using periods at the end of sentences, commas to separate items in lists, question marks for direct questions, and quotation marks to denote direct quotes. Punctuation helps clarify meaning and ensure readers can understand the context.