Do I need a filling or bonding for my chipped tooth? (Photo)

Bonding is a type of dental filling material.  It is know as the "tooth colored" filling material.  The method used to put the filling in/on the tooth is a bonding type method, vs a packing method used for amalgam, or silver, restorations.  Unfortunately when the front teeth chip like yours did, the bonding/filling material does not always last.  I can tell from the tiny photo you uploaded that you are a grinder.  Grinders/clenchers tend to chip and break teeth more often.  If the chip is tiny, it can be polished and smoothed.  However, a larger chip would require a restoration--either a small filling or a veneer (I tend to recommend the veneer for many reasons).  It would also be in your best interest to invest in a nightguard to protect your teeth.

your dentist is right no need to worry about that. but if u r more conscious about cosmetics , u can go for tooth coloured bonding ,

In this situation "bonding" and "filling" are the same procedure.  If the appearance bothers you I would definitely look into bonding to straiten the edge back to its original length.  Most likely the damage from the candy is done and won't chip away a hole lot more if at all.  From a structural standpoint you don't have to do anything to restore it.  However, if you want something done I would stay away from smoothing the edge down as this will shorten the edge further and do a simple and painless bonded filling.  

If a chip is small it can sometimes be simply smoothed off and will not likely chip.  If you have questions about your treatment it may be helpful to have a conversation with your dentist.  Things are probably going to be fine.  Watch out for those Jolly Ranchers. Good luck!