tags

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Sometimes when i comment on a members discussion i put the tags in sometimes I don't but can someone tell me what they are for is there a tag search on here, does it matter that you don't put a tag onto your comment or discussion? Can I find a discussion by typing in the tag or is it just something used on here to put a discussion into a catagory? I'm a little confused as to what the tags are for can you enlighten me please.