How to understand these terms in SD?

Hi all,

I have encounted some terms when I tried to understand SD module. Please can some explain these terms in SD as following,

1. Sold-to party

2. Ship-to party

3. Bill-to party

I tried to create the a sales order, i hadn't found where we can define it? can someone tell me when can we define it and what is the table field? Thanks a lot!

Any response will be awarded.

Regards,

Samson