One can find plenty of graphic design job openings on every single job board. We typically apply for most of them, or at least for few, to increase our chances of getting some invitations for an interview… But you should not leave this kind of an impression in an interview.
Recruiters are proud on their companies. They believe to be the market leaders, even if it is far from truth. Therefor, you need to convince them that this job interview is special for you, that it stands out from the group of other, similar positions. They should not get an impression that it is just another meeting with another employer on your long list…
Do your research
They may use alternative questions too. Why do you want to work for our company? Why not one of the competitors? Question may be changed slightly, but the intentions stand the same… Therefor, you should research the job description and the website of the company, to find something that differentiates them from the competition.
If you can not find anything exceptional on the job board, go to their website, check their portfolio, read about their values and goals. You should find something extraordinary to talk about in your answer.
Your job description is designed exceptionally, in both graphics and wording. One can see that even an HR person from your company is a creative mind. It signifies for me that this is the company where one can grow and improve every day as a designer. The list of working duties was very interesting for me too. Brand building is a field I would really love to be involved in.
I spent a lot of time on your website. I saw the work you have done and I really liked the deign you made for client ABC, as well as the campaign you created for EDF. I have seen countless portfolios before, but I believe you are one of the most creative companies involved in marketing in our country. That caught my eye on your offer and I would be really proud to work in your company.