Zero Trust is a security concept and framework that assumes no trust, even among users and systems inside the corporate network.
Traditionally, network security models operated under the assumption that everything inside the corporate network could be trusted and that once someone gained access to the network, they could be trusted to access various resources.
This is no longer viable in 2023 and beyond - with the increase of sophisticated cyber attacks, denying by default has become the norm for companies looking to secure their sensitive data.