The test strategy is an organizational-level document that describes the general test approach, i.e., what needs to be achieved and how to achieve it. This document is outside the scope of the software testing life cycle (STLC) and does not specify testing requirements for a specific project. Instead, it establishes the common testing principles for all of the organization's projects.
When software scales and the team grows, an unchallengeable need for the right test tool and strategy arises. By incorporating an effective test strategy, you can ensure a bug-free application.