Area under the curve is given by which function?

1. Two related functions describe a continuous distribution. 2. The curve itself is the probability density function. 3. Area under the curve is given by a different function. 4. That function is the cumulative distribution function, abbreviated cdf. _Source: OpenStax Introductory Statistics 2e (CC BY 4.0), Ch 5 'Continuous Random Variables', sections 5.1-5.3_