"Class 3" refers to a grade level in the Indian education system. "What is Cooking" is the title of a chapter in the Class 3 EVS (Environmental Studies) textbook. The chapter discusses various aspects of cooking, such as the utensils used for cooking, things that can be eaten raw, things that need to be cooked, and methods of cooking. The chapter also includes questions and puzzles to help students practice the lesson. The chapter covers topics such as:

• Utensils used for cooking, such as pans, ladles, pots, mesh skimmers, roti tawas, frying pans, cookers, and turning spatulas.
• Materials used to make utensils, such as steel, copper, aluminum, iron, and glass.
• Things that can be eaten raw, such as fruits and vegetables.
• Things that need to be cooked, such as pulses, rice, and chapatis.
• Methods of cooking, such as boiling, frying, baking, and steaming.
• Different types of burners used for cooking, such as LPG cylinders, cow dung cakes, kerosene oil, wood, coal, and electric heaters.

The chapter aims to provide students with an understanding of the importance of cooking and the various aspects involved in it. It also encourages students to observe and learn from their surroundings, such as by watching someone cook in the kitchen.