depending on the scale you website is (if your expecting lots of traffic then this might not being the best method) you could use SQL and PHP
Hmm, yes, what do you mean?? How can you associate SQL and PHP with having comments on his website??I can't think of having the connection.
@tanvirzafar: Things doesn't always come in a snap, you have to work for it, interact with other websites, recommend your website, be sure that they will like your post, if it's interesting for the readers, for sure they are going to leave a comment on your posts..