Equal protection under the law is a cornerstone of American civil rights. The 14th Amendment's Equal Protection Clause prohibits discrimination based on race, gender, and other protected characteristics, shaping landmark court decisions and anti-discrimination laws. Courts apply different levels of scrutiny to evaluate equal protection claims. Strict scrutiny is used for race-based classifications, intermediate scrutiny for gender, and rational basis review for non-suspect categories. These standards have evolved through key cases and continue to shape modern equality debates.