# INT_32_BE in PBKDF2

Trying to understand PBKDF2 in detail. It is clear that the password and the salt is given to the PRF (which is HMAC-SHA-1 in the specification). But what is the role of the INT_32_BE(i)? What does it call? Is it ORed (||) with the salt? And what is the value of INT_32_BE(i) any way? Is it 1? Can anyone clear this out?

U1 = PRF(Password, Salt || INT_32_BE(i))