I plan to visit several Schengen countries in succession, e.g. Greece, Italy, Switzerland, Germany, and France, within a three-week period.
In other words, I plan to visit Greece and straight after Greece, I want to travel into Italy, and straight after Italy, I want to enter Switzerland, and so on.
Does my travel plan require multiple entries because my plan involves visiting a Schengen country and then leaving it to enter another Schengen country straight after?
Do I need a single-entry or multiple-entry visa?
I have tried to Google and search for the answer on StackExchange, but I just could not find a clear answer.