Update README.md (#3569)

Co-authored-by: cmo-pomerium <91488121+cmo-pomerium@users.noreply.github.com>
Co-authored-by: bobby <1544881+desimone@users.noreply.github.com>

README.md

@@ -7,7 +7,9 @@
 [![LICENSE](https://img.shields.io/github/license/pomerium/pomerium.svg)](https://github.com/pomerium/pomerium/blob/main/LICENSE)
 ![Docker Pulls](https://img.shields.io/docker/pulls/pomerium/pomerium)
 
-Pomerium is an identity-aware proxy that enables secure access to internal applications. Pomerium provides a standardized interface to add access control to applications regardless of whether the application itself has authorization or authentication baked-in. Pomerium gateways both internal and external requests, and can be used in situations where you'd typically reach for a VPN.
+Pomerium is an identity and context-aware reverse proxy that brokers secure access to apps and services at scale. Pomerium provides a standardized interface to add access control to applications regardless of whether the application itself has authorization or authentication baked-in.
+
+Pomerium can be used in situations where you'd typically reach for a VPN, but, unlike a VPN, does not require a client and uses identity and context, not network locality to determine access.
 
 Pomerium can be used to: