What is the relationship between the sampling frequency and the DFT frequency domain of a signal

The sampling frequency determines the maximum frequency that can be represented in the DFT frequency domain. Specifically, the maximum frequency that can be represented in the DFT is half of the sampling frequency, also known as the Nyquist frequency. Any frequency components in the signal that exceed the Nyquist frequency will be aliased and cannot be accurately represented in the DFT. Therefore, it is important to choose a sampling frequency that is at least twice the highest frequency component of interest in the signal