When living in Germany, you are required to pay the TV Tax in Germany (Rundfunkbeitrag). This tax costs €18.36 per month and is paid towards the Beitragsservice, which is the public service institution in charge of German public broadcasters on TV and radio. However, this tax is not charged per resident but instead per household.
This means that living alone will cost more than living in a shared flat for example, as you can split the bill with your housemates. Each resident will receive a letter telling them to pay the fee of €17.50. If someone in your household is already paying for it, then simply state so in the letter and send it back.