As their name suggests, these are actually software integrated solutions which are utilized in order to gain full control over the access or entry points of a home, building or any place where it is in use.
It makes use of various mechanical components such as door barriers, electronic locks as well as BOOM barriers amongst others. It would restrict access to people whose identity cannot be confirmed by a smart card, RFID card or their biometrics.
What Can It Do?
Well, the capabilities of access control systems actually vary greatly. There are systems which were designed to handle a single door. These are referred to as standalone systems which you can program through the use of a keypad. You can visit https://ryalex.com.au/solution/access-control/ to know more about the access control system.
There are also medium-sized systems which are computer-based as well as "enterprise" systems which are commonly used in buildings wherein there is the need to communicate as well as control thousands of card readers on multiple continents.
However, if the software is used, it would immediately recognize the RFID card as invalid and would not grant that person entry. Think of it this way, what use is a gate if there's no one there to asses which people can enter and which ones can't? I mean, you cannot lock everyone out thus the need for someone or in this case, something, to restrict and allow entry.
Why Is There A Need for It?
Some people would think that have security guards in place would be enough. Whilst there is truth to that, these guards can only do so much when it comes to the people who come and go inside the building. Needless to say, access control systems would help streamline their work and make everything more efficient.
This automation would allow them to focus on the other aspects of making sure that your building is secure. But don't think that these systems are only good for securing buildings. As a matter of fact, they can be used for a variety of purposes. From traveling tickets to cattle farming, you would be surprised at the different applications for this nifty system.