The ability and means to communicate with or otherwise interact with a system, to use system resources to handle information, to gain knowledge of the information the system contains, or to control system components and functions.
Source: CNSSI 4009
Logical Access Control
Logical Access Control is the ability and means to allow or deny logical or computer-based access to data of one kind or another. Keeping in mind the CIA of Cybersecurity (Confidentiality, Integrity, and Availability) logical access control typically pertains to Confidentiality – making sure only the people who should have access to something are the ones with access to that data set.
Physical Access Control
Physical Access Control is the ability and means to allow or deny access to a physical location within a building, company, or even within a room at a company.