Simple Definition:

Charity is the act of giving assistance or support to those in need (needy people who require help). This can be done through donations of money, goods [valuable items such as clothing], or services [actions that can be done to help others]. For example, donating clothes to a homeless shelter or volunteering at a food bank are both acts of charity.

Very Simple Definition:

Charity is helping people who need it. It could be giving money, things, or your time to help them. For example, giving clothes to a place that helps homeless people or working at a place that gives food to people in need are charity.