Germany is a very "green" country, all the trash is always separated. The country uses an incentive system, called the Pfandsystem, to help ensure bottles are returned to be recycled. You can save money by bringing your own bottles back to the grocery store for a credit that you can use at the register. For a turned plastic bottle, you will get 25 cents, and less for glass bottles.
If you aren’t going to return your bottles yourself, especially if you don’t think you’ll get enough glass bottles to turn in at once, then leave your bottles outside next to trash cans instead of putting them in the bins. Locals in need of cash and with time to spare, like the homeless, students, and the retired, will come by and collect them to turn them in. This way your bottle still ends up getting recycled.
Waste separation means that different types of garbage are collected and recycled separately. In Germany, waste separation starts with the consumer, i.e. households sort their trash and put it in separate bins and containers.
In big cities, there are four different bins in almost every backyard. In the countryside, you may have to drive to a recycling plant to find all these bins. You'll also see those bins around any city and there are always some at S- and U-Bahn stations.
Only certain types of waste may be thrown into each bin:
You should follow these waste separation rules even if you're in Germany as a tourist!