The sequence "110000101" is a binary number, which is a system of representing values using only two digits: 0 and 1. In this case, it consists of nine digits, where each digit represents a power of 2, starting from the rightmost digit. When converted to decimal, "110000101" equals 389. This conversion is done by calculating the sum of the products of each digit and its corresponding power of 2. Binary numbers are fundamental in computing and digital electronics, as they are used to represent data and instructions in computers.