The system of binomial nomenclature was proposed by Carolus Linneaus (1707 – 1778). Conventions of writing biological name are as follows:

The biological name is composed of two terms. The first term is called genetic name and the second term is called species name.
The genus name starts with a capital letter, while the species name starts with a small letter.
In print, the scientific name is written in italics.

When handwritten, the genus name and species name need to be underlined separately
It is a process of giving name to things. binomial means two hence every living thing is given two name. mostly in latin
eg. homo sapiens 
bos bubalis