👉 In mathematics, a congruence is an equation that holds true for all numbers or expressions in a given set under certain conditions. It is a statement that two quantities are equal. For example: x^2 + 4 = 0 is a congruence because it holds true for every x that satisfies the equation. A congruence can be described using symbols, such as < and >, to specify conditions under which the equality is true. For instance, in the above equation