In Germany, as an employee, you are automatically signed up for Pension Insurance. This covers you from the first day of employment. You receive a pension, if you're working in reduced capacity, or if you're old, and has other benefits.
For 2022, it is 18.6% of your income. Your employer and you will split it equally (9.3%). If your income exceeds 84,600 € per year, your contributions will be based on 84,600 € and not your income.