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ATtiny85
Specs
Programming
You need an Arduino UNO to flash programs to the ATtiny. Also, it runs by default at 1MHz so if you want it to run at 8MHz you need to burn the bootloader into it after having selected the appropriate frequency.
Arduino in the past did not support ATtiny by default and additional libs had to be provided. Sooner or later this might not be the case anymore.
The Arduino UNO needs to be flashed with the ISP program : File > Examples > ArduinoISP
Set Arduino to ISP, usually located in the IDE in Tools > Programmer > Arduino as ISP