newbie - difference between bulbs

Hi everyone i'm a new member to the forum , have had my micra for 2 and a half years now and love it!
I have had my headlight bulb blow on me today though and looking at halfords online i'm abit confused on what bulb it is I need

what is the difference between a dipped beam and full beam bulb , I've read around that they are the same but then when do they sell them under different names?

am i better off getting the full beam one?

thanks for any replies and please don't laugh at me if this seems to be a really obvious answer

this is my first car so i'm yet to work everything i need , i'm kind of just learning as i go along atm :/
 
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