Bobbins and the Bobbin Case
Bobbins are basically small cylindrical accessories that wrap up the thread around them. They are placed in the bobbin case that is specially designed for them. As we have talked about the upper thread and the lower thread, this bobbin will help the lower thread to function during the sewing process.
This is how when you start sewing, the thread will automatically be supplied and will come in contact with the upper threads.