What is a timing device, crystal oscillator, digital timing device, transmitting data

 50MHz ±50ppm 50pF HCMOS/TTL 55% 3.3V 4-Pin SMD Oscillator

https://www.futureelectronics.com/p/electromechanical--timing-devices--oscillators/cb3lv-3c-50m000000-cts-5629860