Light Machine Guns are powerful long-range weapons with large magazines that can be used to suppress an area for extended durations. LMGs have great bullet penetration and can be used to take out enemies behind light to medium cover.
LMGs might be powerful, but they slow your movement speed, have slow ADS times and inaccurate hip-fire spread. LMG reload times are also extremely slow, but they do make up for it with their large magazine sizes.