Let's figure out what nirvana is. The word "nirvana" comes from Sanskrit and literally means "extinction" or "cessation." Imagine that within you there is a flame of passions, desires, and fears. Nirvana is a state when this flame goes out, and you feel inner peace and harmony.
Nirvana in Buddhism is the ultimate goal that all Buddhists strive for. It means liberation from the cycle of rebirths, when there is no longer a need to be born again and again, experiencing the sufferings and joys of life. It's like stepping outside the game called "life" and simply observing from the sidelines, not getting involved in all these processes.
Perhaps nirvana seems somewhat abstract, but you can imagine it as a state when you feel good just being yourself, without the desire to constantly seek something more. For example, when you watch a beautiful sunset and feel that you need nothing more — this is a little piece of nirvana.