ยินดีต้อนรับ (yin di ton rap)
This is a formal phrase used in a variety of situations.
Here are some other ways to say "welcome" in Thai, depending on the situation:
* ยินดีที่ได้พบ (yin di thi dai pob) - "Nice to meet you" (more informal and friendly)
* ยินดีที่ได้รู้จัก (yin di thi dai roo jak) - "Nice to know you" (more formal and friendly)
* ขอต้อนรับ (kor ton rap) - "Welcome" (more polite and formal)
You can also use the phrase สวัสดี (sa-wat-dee), which means "hello" and can also be used as a greeting that implies "welcome".
It's important to note that Thai people are known for their hospitality and welcoming nature. They may use other phrases or gestures to express their welcome, even if they don't use the specific word "welcome."