What are innoDB Tables ?
One of my WordPress blogs had some problem so I asked my hosting provider to restore them. He said he can restore most of it but he cant restore some innoDB tables. Can anyone explain what they are and how they are used in WordPress. Also will they hurt my blog in anyway ?
Oh dude... Google it.
InnoDB is a method of storage for MySQL databases - it's now considered the preferred storage method.
Google will have links that explain this 100%.
If your hosting provider can't supply reliable restores of your databases then you need to find a new host.