Hi
In short
Hi is a common English greeting used to acknowledge someone or start a conversation.
In plain words
It is a friendly and informal way to say hello. People use it when they meet friends, colleagues, or strangers in a relaxed setting.
A simple example
If you walk into a local shop, you might say 'Hi' to the shopkeeper to start your interaction. It is much less formal than saying 'Good morning'.
Why it matters
It serves as a social lubricant that helps break the ice. Using it correctly helps set a friendly tone in daily communication.
Easy to mix up
Do not confuse it with 'High', which refers to something being at a great distance above the ground.