What is a full stop and what are its uses?

A full stop is a grammatical symbol used to end a sentence. It appears as this:

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It is simply a dot at the end of a sentence or period of speech to signify that it is over. It is used to make paragraphs of writing coherent and understandable. If there were no full-stops inserted into a passage of text, it would be nearly impossible to understand and highly irritating to read and discern.