Commonly people use a web forum as the centre point for a web community. However building a forum is no easy task and requires patience and dedication. You may have heard that having a web community is a great way to increase sales, customer loyalty and Profitable for your web business if large enough and targeting an affluent demographic.
Perhaps the least important variable, but certainly a vital aspect, is the forum software you choose. The top quality free forum out there is phpBB which is the open source offering. I haven't used this myself but with Invision no longer being free I can see this being the main player for all small business forums. I see this forum everywhere so I think you can take that as a strong endorsement.
Another popular choice, especially for large companies that can afford the fee is vBulletin. This seems to the professional forum of choice for those with the moolah to afford it. I only played with this forum many years ago when they had a limited use free version. It's definitely a top forum with a great design, but you pay for it.
As I said which forum software you choose is not too important. You are going to have to learn to use at least one, so choose the one that satisfies your criteria and then get playing.
Note this often either costs money or is advertiser supported so you might have some icky banners or other ads streamed across your forum. I recommend you host the forum on your own server because you get control, ownership and better search engine benefits.
Today There are a new free and easy ways how to prepare all of this before you started your own bussiness and created a forum, spend your time for 5 - 10 minutes to take a look for this opportunity.
hope you will not regrets