Avast antivirus or Avast Internet Security? Which one is best for online business purpose?
if you are a company that is looking for av protection:
http://www.avast.com/business
depending on what your demands are and for how many clients and which servers (fileservers, exchange, sharepoint for example)
if your private user, you could go for the free version, but if you go for the internet security package you also get firewall and antispam and stuff.