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Here, HTTP, FTP, SMTP, POP is described in computer networks.

HTTP

Port no. 80
Itself not reliable but uses TCP to achieve reliability.
Inband Protocol
Stateless
HTTP 1.0 NonPersistent
HTTP 1.1 NonPersistent
Commands(Head, Get, Post, Put, Delete, Connect)
In this video full concepts all application layer protocols like HTTP, FTP, SMTP, POP are explained.

0:00 Introduction
1:23 HTTP
9:28 FTP
12:38 SMTP and POP

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