 Kindergarten originates  from German , which literally means "garden  
So a garden of kids?  My son went to Kindergarten.
is a preschool educational approach traditionally based on playing, singing, practical activities such as drawing, and social interaction 
I remember my kiddo learning lots of songs and playing lots of games in kindergarten.  
The named was given by German Friedrich Fröbel, whose approach globally influenced early-years education.
It must be successful, because it is still going on!
Its synonymous with preschool, also known as nursery school, pre-primary school, playschool or kindergarten, is an educational establishment or learning space offering early childhood education to children before they begin compulsory education at primary school.