Which theory is being talked about in the given passage?

strong >Refer to the following information to answer the next 4 questions To better understand what motivates human beings,  a famous American psychologist proposed that human needs can be organized into a hierarchy. It is one of the most popular theories on motivation that explains that humans are highly motivated to fulfill their needs, which is based on hierarchical order that starts with the most basic needs and subsequently moves on to higher levels. The main goal of this need hierarchy theory is to attain the highest position or the last of the needs. According to the theory, when a lower need is met, the next need on the hierarchy becomes our focus of attention.