The opportunity card (Chancenkarte) is a type of National Visa. It allows you to stay in Germany for 12 months to find a job. It mostly replaces the job seeker visa.
The opportunity card lets you work 20 hours per week while you look for a full time job.1 To work full time, you must get a work visa or a Blue Card.
You must apply for a job seeker visa at the German embassy or consulate in your home country.