what the difference between ‘thank’ and ‘appreciate’?

Question

Answer

Thank is what you do to others.
Appreciate is how you yourself feel.
"Thank you for your correction, I really appreciate your help."

Thank YOU
I appreciate

Answer

Difference is slight.

Thanking a person is in words expressed form of showing appreciation to that person:
Friend helps you at work. You tell them: "Thank you for helping me."

Appreciation is more than just expressing thanking. It is when you feel respect to person due his actions that effect you directly or indirectly:
Friend helps you at work. You appreciate it.
Friend helps you at work. You show appreciation with gift.
Friend works with you. She has a lot of work. You ask her to help you. She accepts. You tell her: "I really appreciate that". After work is done you may tell her: "Thank you for your help"

I hope that explains.

Answer

"Thank you" is customary after someone has helped you with something. "I appreciate what you've done for me" is a formal thank you.

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