This is the 3380th most frequent Turkish word.
kaydını
"Kaydını" means "your record" or "your registration" in English.
In this sentence, 'kaydını' refers to the 'registration record' of the person being addressed in the second-person singular form.
Kütüphaneye üye olduktan sonra kaydını tamamladın.
After becoming a member of the library, you completed your registration.
Here, 'kaydını' denotes the 'stored information' related to the person being addressed (e.g., in a phone contact list).
Telefonunda kaydını buldum, bu numaraya daha önce mesaj atmışsın.
I found your record in the phone; you had sent a message to this number before.
In this example, 'kaydını' is used to refer to a 'recording' of a song, indicating music or audio content created and stored.