What is a byte?

What is a byte? Seeing as it is the best way to start off, I first looked to the Webster Dictionary for a start point. According to Webster's Dictionary, a byte is defined as "a string of binary digits (bits), usually eight, operated on as a basic unit by a digital computer."
By this definition, a byte is a collection of bits in binary code, which is 1s and 0s for digital computers. They allow a digital computer to read and store information by reading the binary code and measure the size of the file. For example, if one were to look in their Documents file on their computer, chances are there would be a file saved reading a certain number of KB. What it means is that the file has a size of however many Kilobytes. Since a bytes are measured in groups of eight bits, one bit only equals .125 bytes. This differentiation is important between kilobytes and kilobits, because the file size is vastly different. (http://kb.iu.edu/data/ackw.html).