From Wiki (because we all know what we read on the internet is always TRUE!)
Acoustic and audio applications In acoustic and audio applications, impulse responses enable the acoustic characteristics of a location, such as a concert hall, to be captured. Various commercial packages are available containing impulse responses from specific locations, ranging from small rooms to large concert halls. These impulse responses can then be utilized in
convolution reverb applications to enable the acoustic characteristics of a particular location to be applied to target audio.