[AC Question]

Hello , I have a 40gb micro sd card and I was wondering:

1.) What is the main differences between internal and external memory of a smartphone?

2.) What kind of data/apps should be installed onto the internal memory of the phone and what kind of apps and data should be installed onto the external memory/micro sd card?

3.) I have several video game emulators (Drastic DS emulator, John SNES emulator, and MyBoy GBA emulator) and 2 full 3D games that were released to android (GTA San Andreas, Vice City) and I was wondering which memory storage should these particular apps/games be installed on?