What I Have Learned Binary refers to a representation of numbers using only two digits (0 and 1). The term bit is an abbreviation of binary digit and is the smallest unit of data. To convert a decimal number to binary, divide the number by 2 then get the quotient and the remainder. Bring down the quotient, divide it by 2, and get the quotient and remainder again. Stop when the quotient results to 0. Copy the remainder from bottom to top.