I am not interested to give very large explanation. So I am providing you actual definitions in short, If you still have any doubt then please let me know, I will explain you in my own language.
Test Scenario is a set of test cases that ensure that the business process flows are tested from end to end. They may be independent tests or a series of tests that follow each other, each dependent on the output of the previous one. The terms "test scenario" and "test case" are often used synonymously.
The scenario language is used to define the scenarios. Each scenario consists of a scenario name, the first word in a scenario, that may be followed by scenario elements. These elements may be simple elements or directives. Comments may also be included to describe the test scenarios and their purpose.
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Test Scenario is a set of test cases that ensure that the business process flows are tested from end to end.
Every Scenario may not be end-end.
Scenarios are derived from Functional Scenarios. Once functional decomposition is done, based on Functional scenarios Test scenarios are derived, hence may not be end-end.
Most of the time Scenarios are series of tests that follow. Will follow the ETVXM architecture.
Scenario naming is again derived from Functional Scenarios, organization wide, project wise naming and template is followed.
In layman terminology you can say a Scenario is a work flow which covers the individual functionality.
Test scenarios are based on a hypothetical story to help a person to think through a complex program or a system. Test Scenario is a workflow with no of test cases.
Some real time situations or work flow or real existence of work that how we going to do that thing.
Example: - we decided to go some where by bus. So as we planed that we will take the bus from that stop & reach that palace.