What is a “run-on” sentence?

Run on sentences

Run on sentences, also known as "fused sentences", contain two independent clauses, either of which can stand by itself. When these two independent clauses are connected by a comma, it is known as a comma splice. Another point about run on sentences is that it really doesn't matter about the length of the sentence. A run on can be a very short sentence, such as "Nothing is on t.v.,I should turn it off,".