Step group is a set of Test Steps that are used together to perform a task (Filling a signup form OR Login page).

For Example, login steps are common for many test cases. In that case, we can create a step group with login steps and later we can use the same step group wherever we need to reuse the same login steps thus avoiding duplicate creation of same steps.

In Testsigma, Step Groups are implemented as a variation of Test Cases i.e you can create Step Groups in a manner similar to a Test Case.