There are two types of taglines. A tagline can be an incomplete sentence, usually accompanying a company logo. A slogan is usually tied to an ad campaign, and may be temporary. It’s usually created to be memorable.
Example: Alka-Seltzer
Tagline: Complete relief from headache, indigestion, heartburn, and upset stomach.
Slogan: Plop. Plop. Fizz. Fizz. Oh, What a Relief it Is!