The bond joining the two hydrogen atoms is 'Covalent bond'
A covalent bond is also known as molecular bond which is a chemical bond that involves the sharing of electron pairs between atoms.
Two hydrogen atoms with a pair of electrons shared between these 2 atoms are joined by 'Covalent bond'. Bond formed by sharing of electrons will always be 'Covalent bond'.
Note : H is a non-metal and the bond between two non-metals is 'Covalent bond'
[tex] H (non-metal) + H(non-metal) \rightarrow Covalent bond [/tex]