Types of interjection

Answer 1

An interjection has no real value in grammar, they are usually spoken, less often written. Words such as 'Oh', 'Ah', 'Hey', 'Hi', 'Hmmm', 'Eh?' are all interjections

Answer 2

Interjections are words or phrases used to express strong feelings or emotions. Examples include "Wow!", "Ouch!", "Yikes!", and "Phew!" Interjections are typically used to convey a reaction or response in conversation.