Gram flour and besan are two names for the same thing. There is no difference between gram flour and besan; they refer to the same ingredient. Both terms are used interchangeably to describe the flour made from ground chickpeas (also known as garbanzo beans or Bengal gram).
Besan is a popular ingredient in Indian, Pakistani, and Bangladeshi cuisines, where it is used in various dishes, including pakoras (fried snacks), dhokla (steamed savory cake), and various sweets. It is known for its nutty flavor, high protein content, and gluten-free properties, making it a versatile and widely used ingredient in many dishes, especially for those who follow a gluten-free diet.