What is the purpose of testing using paired elements or data?

Pairwise testing aims to verify all possible combinations of pairs of parameters. This significantly reduces the number of tests compared to exhaustive testing of all options, while maintaining a high probability of detecting errors caused by interactions between two parameters.

For example, if you have three parameters with multiple values, pairwise testing guarantees that each pair of values from different parameters will be tested at least once. This is an effective compromise between testing completeness and cost.