The term Japanese domestic market (JDM) refers to the local market in Japan for Japanese-made motor vehicles and components. Within the car and motorcycle hobbyist import scene, this term, and the related term Japanese domestic model, most commonly refer to Japanese-brand automobiles and parts designed and constructed to conform to Japanese vehicle and equipment regulations and to suit Japanese market preferences.

JDM can mean different things to different people but can generally be divided into two groups, Old school JDM and New school JDM.

Old school JDM

Many believe 'Old School' is pre 1987, last year run for Toyota’s AE86.

New school JDM

So anything post 1987 upto new cars. Lots of tuner and drift style cars fit this category.