Requirements describe in detail what needs to be solved or achieved to meet the objectives of your application under development. Clearly and correctly defining requirements at the front end of a project provides the following advantages:
Provides guidelines of what the priorities are to stakeholders
Sets clear expectations among stakeholders
Cuts waste and eliminates unnecessary expenditure
The Requirements module enables you to define, manage and track requirements at all stages of the application lifecycle management.
For task details, see How to Use Requirements in ALM.