Algebra is a branch of mathematics that deals with symbols and the rules for manipulating those symbols. It allows us to represent numbers and relationships in a general way, using letters to stand for unknown values. This makes it easier to solve equations and understand patterns. In algebra, expressions and equations are formed using variables, constants, and operations like addition, subtraction, multiplication, and division. For example, in the equation 2x + 3 = 7, x represents an unknown value that can be solved. Algebra is foundational for higher-level math and is widely used in fields like science, engineering, and economics.