Python expressions are fundamental constructs in the Python programming language that evaluate to produce a value. An expression can be as simple as a single value or variable, or it can be more complex, involving operators and multiple operands. For instance, arithmetic operations like addition or multiplication are examples of expressions that yield numerical results. Understanding expressions is crucial for writing effective Python code, as they form the basis for calculations, data manipulation, and control flow within programs. In essence, every expression is a statement that can be evaluated to a value, making them integral to Python programming.