A website uses HyperText Transfer Protocol Secure (HTTPS) have a secure transfer.
Using HTTPS, the computers agree on a “code” between them, and then they scramble the messages using that “code” so that no one in between can read them. This keeps your information safe from others. They use the “code” on a Secure Sockets Layer (SSL), sometimes called Transport Layer Security (TLS) to send the information back and forth.
On the other hand HTTP:
The Hypertext Transfer Protocol (HTTP) is an application protocol for distributed, collaborative, hypermedia information systems. HTTP is the foundation of data communication for the World Wide Web. HTTP is the protocol to exchange or transfer hypertext.
Basically, its a protocol for transferring hypertext ( different from normal text having links to other pages in a text of articles) from client to server end, but in don’t have any security.