Here's a breakdown:
* "Sawasdee" is used as a general greeting for both "hello" and "goodbye".
* "Sawasdee krap" (for men) and "Sawasdee kha" (for women) are more formal greetings used when addressing someone older or of higher status.
Fun Fact: "Sawasdee" is derived from the Sanskrit word "svasti," meaning "well-being" or "prosperity."