[serve] a purpose

to fulfill a specific function or role, often in a way that is useful or meaningful

A good tool should serve a purpose and make tasks easier to accomplish.
The discussion served a purpose by clarifying our goals for the project.
Hobbies like gardening serve a purpose by providing relaxation and stress relief.
In a team, each member should serve a purpose to achieve the project's objectives.
Educators aim to ensure that every lesson serves a purpose in a student's learning.