What it means
LPR, ANPR and ALPR describe the same core function. In practice, LPR is the label that parking and access control vendors use, while ANPR is the label in traffic enforcement and highway tenders. Some vendors use LPR for the software alone and ANPR for a complete camera system, but there is no fixed rule.
For an access control project, the useful questions are practical. Does the system read two-wheeler plates? Can it open a boom barrier directly? Does it keep working when the internet link drops? Can staff edit the list of allowed vehicles from a phone or a browser?
How it applies in India
In Indian housing societies, campuses and factories, LPR systems replace paper registers and manual checks at the gate. Plates in these places are often dirty, bent, partly covered by stickers or hand-painted, and many vehicles are two-wheelers. Test the system on your own traffic for a few days before you sign an order. For the choice between plate reading and tags, see RFID vs ANPR.