The sequence "11111001" is an 8-bit binary number, which is a way to represent values using only two digits: 0 and 1. In the binary system, each digit represents a power of 2, starting from the rightmost digit. For "11111001," the value can be calculated as 1×2^7 + 1×2^6 + 1×2^5 + 1×2^4 + 1×2^3 + 0×2^2 + 0×2^1 + 1×2^0, resulting in a decimal value of 249. Binary numbers like "11111001" are fundamental in computer science and digital electronics, as they are used to encode data and instructions in computers. This system is essential for the operation of various devices, including computers, smartphones, and digital circuits. Understanding binary is crucial for programming and working with software and {hardware