What is the difference between "remember" and "remind"?

[English Learner]

English Error, Elementary Level

ESL/EFL Test #21 "Thank you letter", question 1

Thank you very much for reminding me on my birthday again after all these years.

(a) reminding
(b) on
(c) birthday

English Error, Elementary Level

ESL/EFL Test #21 "Thank you letter", answer 1

Thank you very much for remembering me on my birthday again after all these years.

Correct entry: remembering
The error was: (a) reminding
_________________________

without on,ok?

[Conchita]

No, you couldn't leave out the preposition 'on' here. The full time expression is 'on my birthday' (on that specific day).