The 42590 LCD1602 + I2C Display is a 16x2 character liquid crystal display (LCD) that connects to the microcontroller via the I2C protocol. This display allows for the display of text and data, and the connection via I2C ensures that only two wires are required for the connection (SDA and SCL), instead of the 16 wires that a conventional LCD display would require. This makes its use easier and more economical, while simultaneously reducing the complexity of the connections. It is ideal for projects with microcontrollers such as Arduino, Raspberry Pi, and other platforms that require a way to display information without the need for complex connections or large screens.