欢迎 (huānyíng)
This is a general greeting used to welcome someone.
There are other ways to say "Welcome" in Chinese depending on the context, such as:
* 欢迎光临 (huānyíng guānglín): Welcome (to our store, restaurant, etc.)
* 欢迎回来 (huānyíng huílai): Welcome back
* 欢迎加入 (huānyíng jiārù): Welcome to join (a group, team, etc.)
Always remember to use the appropriate tone when speaking Chinese.