Why is a sandlot used as a playing area for children?

A sandlot refers to a vacant lot used by children to play games, mostly unorganised ones. Unlike a playground specifically created for certain games, sandlots perhaps developed as informal spaces which children made use of to serve as makeshift playgrounds. In the US, sandlot baseball refers to an advanced version of the game played by teams not affiliated with either the Major or Minor leagues in the country.