Soham is a word in the Sanskrit language, which is an old language from a country called India. Soham is made up of two smaller words: "so" and "ham."
The word "so" means "that" and "ham" means "I am." So together, the word "soham" means "I am that."
This might sound a little strange, but people who practice yoga or meditation sometimes use the word "soham" to help them focus and feel more peaceful. When they say "soham" in their mind or out loud, they are reminding themselves that they are connected to everything and everyone around them.
It's kind of like saying, "I am a part of the world and the world is a part of me." It can help people feel less alone and more in tune with the world.