The bodhisattva vow is a commitment that some Buddhists make to help others become happy and peaceful. It's kind of like saying "I promise to do everything I can to make the world a better place."
When someone takes the bodhisattva vow, they are promising to put the needs of others before their own. That means they will try to help anyone who is suffering or in need, even if it's difficult or inconvenient for them.
They also promise to work on their own minds and hearts, so that they can be kind, patient, and compassionate. This helps them to be better helpers to others, and it helps them experience more happiness in their own lives, too.
Taking the bodhisattva vow is a big deal, because it's a very serious commitment. But it's also a beautiful and inspiring act of love and generosity. It shows that someone is really dedicated to making the world a better place, and that they are willing to do whatever it takes to help others find happiness and peace.