I2C bus, i2c communication, what is an I2C device, I2C vs SPI vs UART

 PCF8575 Series Remote 16-bit I/O Expander for I2C-Bus to Parallel Port -SSOP-24

https://www.futureelectronics.com/p/semiconductors--comm-products--i2c/pcf8575ts-1-118-nxp-7247653