A short, informal way to say goodbye. Used when leaving or ending a conversation.

Interjection — used alone as a complete utterance. Common variations: bye-bye (more childlike or affectionate), bye for now, bye then. Can be combined: 'Bye, see you later!' or 'Bye, take care!'

In British English, 'cheerio' is another informal farewell similar to 'bye'. 'Ta-ta' is used in some parts of Britain, especially in the North. People often say 'bye' multiple times before actually leaving — this is humorously known as 'the British goodbye'.