**Definition: **A branch of mathematics that substitutes letters for numbers. An algebraic equation represents a scale, what is done on one side of the scale with a number is also done to the other side of the scale. The numbers are the constants. Algebra can include real numbers, complex numbers, matrices, vectors etc. Moving from Arithmetic to Algebra will look something like this: Arithmetic: 3 + 4 = 3 + 4 in Algebra it would look like: x + y = y + x

**Also Known As: **Historically: al-jabr

**Examples: **Algebra is an abstract concept in mathematics.

For a complete overview of what Algebra is, please see the full article about Algebra.