Semi-colons

You can use a semicolon in place of a period between two sentences without a conjuction.
 * A semicolon is a punctuation mark that indicates a pause between two main clauses.**

//Email me the project; I'll work on it tonight.//
 * Use a semicolon //before//** **certain introductory words.**
 * namely
 * however
 * therefore
 * that is
 * i.e.
 * for example
 * e.g.
 * for instance

//She has relatives from Los Angelos, California; Austin, Texas; and even Miami, Florida.//
 * Use semicolons to separate a series when there is more than one comma needed**

To simplify what the other person said, it is typically used in sentences to seperate two indepentent clauses that are meant to go together. For Example: His name is Bob; he is a boy.

She is on the swim team; she practices at the high school's pool.
 * Use a semicolon to join two complete sentences about a similar topic without a conjunction.**