Bai-Muajjal

Bai-Muajjal: Bai means 'Sale and purchase' Ajal means a fixed time or a fixed period.
So, Bai-Muajjal means 'sale for which payment is made at a fixed  date or within a fixed period. In short, it is a sale on credit.

Bai-Murabaha

Bai-Murabaha:
Bai means 'Sale and purchase'. Ribhun means 'an agreed upon profit'.  So, Bai-Murahaba means 'Sale on agreed upon profit.'

Bai Salam

Defination: Bai-Salam means advance sale and purchase. Bai means sale and purchase. Salam means advance.