Germany is known for its efficient public transportation system and well-structured road network, however having a driving license can still be advantageous. If you're a foreigner residing in Germany, depending on your country of origin, your driving license might be valid in Germany; if you come from one of the following countries, you can exchange your driving license for a German one relatively easily: Andorra, Hong Kong, Monaco, San Marino, Namibia, Australia, New Caledonia, Canada, New Zealand, Channel Islands, Croatia, Singapore, French Polynesia, South Africa, Isle of Man, South Korea, Israel, Switzerland, Japan, U.S.A. (certain states). You can find more information on valid licenses in Germany here

International Driving Permit (IDP)
If you visit Germany for a short time, you can drive during your visit, an International Driving Permit (IDP) may be sufficient for a short stay. However, it's not a substitute for a full German license for residents, and is only valid for up to six months. Afterwards, it is no longer recognized by the authorities.

Getting a German Driver's License
If your driver’s license is not valid and you plan to reside in Germany, you will need to take a driving test to obtain a German driver's license. Here are some points you need to know:

1.Eligibility Requirements:
To apply for a German driving license, you need to be a resident of Germany. Depending on your home country, you may need to take a theory and practical driving test or can transfer your existing license without exams.

2.First aid course & Eye Test
To apply for a driver's license (Antrag auf Erteilung einer Fahrerlaubnis), you must provide documentation proving you completed a first aid course. You also have to see an ophthalmologist or optometrist to have your eyes examined.

3.Theory Test:
You have to take a written theory test on traffic rules and road signs.

4.Practical Test:
You will need to undergo behind-the-wheel training (for around 20 hours) with a certified driving school and pass a driving test. This can be a significant commitment in terms of time and cost.

5. Required Documents:
Prepare such necessary documents as your passport, residence permit, proof of address, and your existing driving license (if applicable). Each licensing authority may have specific requirements.

6. Registration at the Local Driving Authority:
Contact your local driving authority (Führerscheinstelle) to register for the theory and practical exams, and to submit your application for a German driving license.

7. Driving Schools:
Depending on your country of origin, you might need to enroll in a driving school (Fahrschule) to receive professional training and guidance for the practical test. This can be helpful if you're unfamiliar with German traffic rules.

8. Costs:
The cost can vary widely depending on your location and the driving school you choose. Be prepared for expenses associated with driving lessons, exams, and administrative fees. Estimated costs change between 1500 to 2000 Euros, depending on your specific requirements.

9. Duration:
The process of obtaining a driving license can take up to several months, so plan accordingly. You can also find intensive courses which reduce the time you need.