Advice on camcorder with ext mic and maybe headphones

I want to buy a budget priced camcorder with an external mic. I am beginning to realise not many have this feature.

It will be used to record small music gigs and my daughter singing, which is why I want the external mic as the sound will be better.

I am not sure what the headphones sockets are used for. But dont want to be stupid and realise after buying - what kind of scenario would they be used for?

Any advice much appreciated. I have looked on the web but posts seem to be out of date. Of course I need a model available to buy now.