Appositives are nouns or noun phrases that represent the same thing and sit next to each other in a sentence. For example,
My wife, Jenny, should know how lucky she is to be married to me.
Here, My wife and Jenny are the same person; Jenny serves to explain my wife.
Apposition is a technical concept. In fact, [...]

Recognizing the difference between a phrase and a clause is key to good grammar.

Misplaced modifiers create confusion as to who is doing what: “Lying in the sand, the waves washed over me.”

The solution: Ensure that the words being modified are next to the modifiers: “The waves washed over me while I was lying in the sand.”