Yajna is like a special ceremony where people offer something to the gods or spirits. It's like a big party with special rules. During yajna, people put things like food, flowers, or special items on an altar or fire as a gift to the gods. This is called an offering. People also pray and chant special words to show respect and ask for blessings. Yajna is usually done by people who follow the Hindu religion, and it's a way for them to connect with their beliefs and traditions. It's like throwing a party for someone you really love and want to show respect to.