Zero Trust Network Access is a newer cybersecurity concept that removes any implicit trust, regardless of who’s accessing and whats being accessed. Historically, organizations assumed that internal users and third parties who had access should be trusted and will operate as they should. The castle-and-moat methods organizations used to protect themselves from cyberattacks have proved ineffective on multiple occasions, with some of the biggest cybersecurity incidents starting from an internal threat or a source that was purposefully granted access. ZTNA is not a specific tool, but a model or an approach that some products and services can provide to organizations.”]
Source: https://www.databreachtoday.com/blogs/zero-trust-more-than-buzzword-p-3171