Hi Harsh,
Catenation is a process of atoms of the same elements forming a ring shape called chains by strong bonding.
When the bonds are open ended it is called an open chain compound and when the atoms are bonded together in a chain it is called a cyclic compound.

Since carbon atoms are small it shows high catenation and strong bonds are formed between 2 carbon atoms.
When M-M bond dissociation energy is maximum, higher will be the catenation, and thus carbon shows high bonding.
Hope you get it if you have any doubts please comment it in the comment box.
Thank you