The Uno R3 with the CH340 USB Chipset is an Uno compatible version of the latest R3 iteration of the Arduino Uno, which is the most popular of the many development boards available for hobbyists. It uses an SMD version of the microprocessor rather than the older style DIP package used on the original product and has some additional features.

Quick Spec

• Microcontroller: ATmega328P
• USB Chipset: CH340
• Input Voltage: 7-12V
• Logic Level: 5V
• Input Voltage: 7-12V
• Digital I/O Pins: 14
• Analog Input Pins: 6
• DC Current per I/O Pin: 40 mA
• DC Current for 3.3V Pin: 50 mA
• Flash Memory: 32 KB
• SRAM: 2 KB
• EEPROM: 1 KB (ATmega328)
• Clock Speed: 16 MHz

Getting Started with Arduino Uno Tutorials

https://docs.arduino.cc/hardware/uno-rev3/#tutorials