What does . mean at the end of a sentence?

The "." at the end of a sentence is called a period, full stop, or dot. It indicates the end of a complete thought or statement.

Here's what it does:

* Marks the end of a sentence: It signals to the reader that one sentence has finished and another one is about to begin.

* Creates pauses: It creates a brief pause for the reader, allowing them to process the information before moving on.

* Separates sentences: It helps to organize text into separate units of meaning.

Example:

"The cat sat on the mat. It was a fluffy, grey cat."

The period after "mat" signals the end of the first sentence and the beginning of the second.