Punctuation marks are a set of symbols that give complete meaning to a sentence by adding the right pauses or by separating words / sentences.

Features:

1. It helps to express & understand a written passage clearly.
2. It helps to put right pauses, separate sentences, express questions, exclamations, etc. 
3. Various punctuation marks are: full stop, comma, apostrophe, quotation, question mark, exclamation mark, dash, hyphen, colon, semicolon etc.

To write correct English, it is very important to understand all the rules for use of various punctuation marks.  

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