Sunday School

[Eva Elisabeth]

Christian denominations/variants in the USA and their features are very difficult for me to understand. (In Germany, believers almost entirely split into Catholics and Lutherans, both taught as a school subject, plus a small %age of Muslims.)

What exactly is Sunday school (it seems to be linked to religion), who is supposed to attend for how long, and to which denominations does this feature apply? Is it a Victorian institution, or still common practice? Was/is it a "must" for faithful believers?

Thanks for any enlightenment on this!