Answer: Voting is a democracy, and any country with voting has a democracy. Now, many people run for office and it is up to us voters to vote for the candidate we best see fit. But, how do we know which candidate to pick, you may ask? Well, I have the answer right here.
Explanation: All the different candidates running for office can make advertisements of many kinds in order to get people to vote for them. These advertisements can be commercials on TV, radio, podcasts, and more. Now, when these advertisements are put out, many of these politicians will also speak their beliefs and promises, such as 'free healthcare' and 'lower drug prices' or something like that. Politicians will also make promises to pass or go against laws or propositions, such as 'say no to prop 777' or 'say yes to prop 890' (not real propositions, just examples). By voting for someone, you are showing that you agree with that person and/or share their beliefs on certain laws and propositions. In addition, voting for different political parties can also show your beliefs, like voting democrat or republican or independent for example, as all of the different parties have candidates with different beliefs.
Hope this helps!