What is a credit-building loan?

A credit-builder loan is a loan whose only purpose is to help you increase your credit score. Credit-builder loans function the complete opposite way of a regular loan – you pay money to the lender in installments (which go into a savings account), and then you receive the money at the end.

Or 

You receive a personal loan at 1% or no interest rate in promise to pay the amount in 12 to 24 months while having the on-time payments reported to the 3 major credit burials.