How should a semi colan be used in a sentence?

The semicolon (;) has only one major use. It is used to join two complete sentences into a single written sentence when all of the following conditions are met:(1) The two sentences are felt to be too closely related to be separated by a full stop;(2) There is no connecting Word which would require a comma, such as and or but;(3) The special conditions requiring a colon are absent.