Update README_EN.md

Author: gnbdev

README_EN.md

@@ -3,7 +3,7 @@
 
 *Note: Most of the content of this article is translated by Google translate from the Chinese version of the "OpenGNB User Manual", the content of this article is subject to the Chinese version.*
 
-[OpenGNB](https://github.com/gnbdev/opengnb "OpenGNB") is an open source P2P decentralized VPN with extreme intranet penetration capability,Allows you to combine your company-home network into a direct-access LAN.
+[OpenGNB](https://github.com/gnbdev/opengnb "OpenGNB") is an open source P2P decentralized Software Defined Virtual Network with extreme intranet penetration capability,Allows you to combine your company-home network into a direct-access LAN.
 
 All code related to the GNB project is released as open source, and the currently released source code supports the following platforms: FreeBSD Linux OpenWRT Raspberrypi OpenBSD macOS