Algebra is the most basic form of algebra and a branch of mathematics. Unlike the arithmetic, where only use numbers and their arithmetical operations (like +, -, ×, ÷), algebra numbers are represented by symbols (usually a, b, c, x, y, z).
Some of the advantages of Algebra:
It helps in the general formulation of arithmetical laws (such as b + a = a + b), and this is the first step towards a systematic exploration of the properties of real numbers.
Allows numbers refer to "unknown", to formulate equations and the study of how to resolve them.