Hello:
* Hola: This is the most common and informal greeting.
* Buenos días: This translates to "good morning" and is used until midday.
* Buenas tardes: This translates to "good afternoon" and is used from midday until evening.
* Buenas noches: This translates to "good evening" and is used in the evening and at night.
Goodbye:
* Adiós: This is the most common and informal farewell.
* Hasta luego: This translates to "see you later" and is often used instead of adiós.
* Hasta mañana: This translates to "see you tomorrow".
* Chao: This is a more casual and friendly farewell, similar to "bye".
You can also use "Qué tal?" which means "how are you?" as a greeting, and "Hasta pronto" which means "see you soon" as a farewell.
Remember: Spanish greetings vary depending on the time of day and the level of formality.