Used to connect words, phrases, or clauses that are similar or related.

और (aur)

English Usage: I would like to have tea and coffee.

Hindi Usage: मुझे चाय और कॉफी चाहिए।

Used to indicate the manner or way in which something is done.

Used to ask about the condition or state of something.

कैसी (kaisi)

English Usage: How is your day going?

Hindi Usage: तुम्हारा दिन कैसा जा रहा है?