base 2 is a positional numeral system with two as its base. It uses 2 different digits for representing numbers. The digits for base 2 could be 0, and 1.

conversion table

base 2	hexadecimal (base 16)	base 2	hexadecimal (base 16)
1	≈ 1	1011	≈ b
10	≈ 2	1100	≈ c
11	≈ 3	1101	≈ d
100	≈ 4	1110	≈ e
101	≈ 5	1111	≈ f
110	≈ 6	10000	≈ g
111	≈ 7	10001	≈ h
1000	≈ 8	10010	≈ i
1001	≈ 9	10011	≈ j
1010	≈ a	10100	≈ 10