Simple answer because politicians create & enforce laws which affect your daily life: From jobs, to health care, to education, etc. Voting helps to ensure that the persons/people who think the closest to you are the ones making the laws. Not voting means that you might spend the next 4 years struggling to find employment...it can mean that your children who enlisted in the army to provide for themselves (because they couldn't find a job) will be risking their live in a senseless war. Not voting is having no concern about your community or future.