"Thank you" in Engpsh is pronounced as "thank you" and it means "谢谢" in Chinese. The phrase "thank you" originates from Middle Engpsh "thank ye". It's a common expression of gratitude and is used in a variety of contexts.
Examples:
"Thank you for your help."
(谢谢你的帮助。)
"Thank you for dinner."
(谢谢你们晚餐。)
"Thank you for your time."
(谢谢你的时间。)