Add "Host" to glossary (#29456)

source/_data/glossary.yml

@@ -239,6 +239,18 @@
     Home Assistant OS, the Home Assistant Operating System, is an embedded,
     minimalistic, operating system designed to run the Home Assistant ecosystem.
 
+- term: Host
+  definition: >-
+    A device that can communicate with other devices on a network. During setup and configuration,
+    an input requesting a **Host** typically refers to a device's network address so that
+    Home Assistant can attempt to connect to it. This may be in the form of a hostname, URL,
+    IP address or some other type of network identifier.
+  excerpt: >-
+    A device that can communicate with other devices on a network.
+  link: https://en.wikipedia.org/wiki/Host_(network)
+  aliases:
+    - hosts
+
 - term: Integration
   definition: >-
     Integrations connect and integrates Home Assistant with devices, services,