This is generally asked for fresher’s.
For this question you answer should include points like why you are best suitable for this job and how the project will improve if they hire you.
It is also good to mention what additional things you can contribute to the team apart from day to day activities. It is good to include that you are good in giving presentation or good to deal with clients, give some examples.
So for that to answer, research a bit about the company and the job position that you are applying for.
So for a programming job, if they are looking for C, C++ with Linux experience. Then you should include those skills in your answer.
You should also say that you are a team player and also good good in communication and good in presentation skills.
Second thing is that you can tell a story on how there was a problem and you solved it by using your skills.
For example, if the client was angry on a teammate and you stepped in and convinced the client to give more time.
Another thing you can mention is what sets you apart from rest of the candidates.
Like you actively volunteer for work, great team player, your love things for quality or give an example where you went beyond the work. You can also show your GitHub contribution if you have any.