What does it mean for BDU and TDU to wear military uniforms?

BDU is the abbreviation of UNIFORM, that is, combat uniform, which is generally worn in combat, training and daily duties, and is different from uniforms and dresses.

TDU is the abbreviation of tactical duty uniform, which means tactical uniform. Its name is more abstract, that is, it is more suitable for combat tasks like CQB than BDU. Unlike BDU, it does not need to consider the use of daily services. TDU is completely designed for combat.