Plain HTTP — the unencrypted web port, now mostly a redirector to 443 and an ACME challenge endpoint.
A web server (nginx, Apache httpd, Caddy, or an application framework) accepts HTTP/1.1 requests here in cleartext, with the target host chosen by the Host header. In current deployments its main jobs are issuing a 301 to https:// and serving Let's Encrypt HTTP-01 challenges under /.well-known/acme-challenge/. It is also the default listener for dev servers, containers, and load balancer backends behind a TLS terminator. Anything on 80 is readable and modifiable by any network in the path.
Fine to expose
Fine to expose when it only redirects to HTTPS and serves ACME challenges; never serve credentials, cookies, or private content over it.
$ curl -sv -o /dev/null http://example.com/Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.