On road and off road bikes?

I'm looking for a bike that I will mostly use on road for the most of the time, but also capable of going on high adventure mountain trails once in a while. I'm not sure whether to go for an on-road bike or off-road mountain bike. And i seriously don't know the different specs that I would have to... show more I'm looking for a bike that I will mostly use on road for the most of the time, but also capable of going on high adventure mountain trails once in a while. I'm not sure whether to go for an on-road bike or off-road mountain bike. And i seriously don't know the different specs that I would have to look for.
Thanks.
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