Test scenario will be framed on basis of the requirement, which need to be checked. For that, we will frame set of test cases, in other terms, we can say all the conditions, which can be determined the testing coverage against business requirement.
Please see the below example, which is exactly matched to my explanation.
As we know all most all the application are having login screen, which contains login name and password. Here is the test scenario for login screen.
Scenario: USER’S LOGIN
Conditions to be checked to test the above scenario:
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1. Test login field and Password fields individually.
2. Try to login with valid login and valid password.
3. Try to login with invalid login and valid password. Etc