What is a period at the end of sentence?

A period (.) at the end of a sentence is a punctuation mark that signals the end of a complete thought. It tells the reader that the sentence is finished and that they should pause before moving on to the next sentence.

Here are some key points about the period:

* Used to indicate the end of a declarative sentence: A declarative sentence is a statement that makes a declaration or states a fact. Example: "The sky is blue."

* Used to indicate the end of an imperative sentence: An imperative sentence gives a command or makes a request. Example: "Close the door."

* Can be used at the end of some types of questions: Questions that are polite requests or indirect questions can end in a period. Example: "Would you mind passing the salt?"

* Used to indicate abbreviations: Periods are used after some abbreviations. Example: "U.S.A."

The period is a fundamental punctuation mark that helps make writing clear and readable.