This is the 40th most frequent Bulgarian word.
как
"Как" means "how" in English.
In this question, 'как' is used as an interrogative adverb meaning 'how' to inquire about someone's identity.
Как се казваш?
What is your name?
In this context, 'както' (a variation of 'как') introduces a comparative clause explaining conformity to a previous request.
Бъди точен, както те помолих.
Be punctual, as I asked you.
Here, 'как' introduces a subordinate clause and explains the manner or way something occurs.