HTTPS protocol (HyperText Transfer Protocol Secure) is a continuation of HTTP protocol for supporting secure data exchange. It allows client and server to provide encrypted communication channel and to send messages by this channel with protection from bugging. Supports TLS/SSL encryption technology.
FTP (File Transfer Protocol) is a protocol for transfer files across the network. It’s one of the base transfer protocols intended for file exchange between computers across the network. With its help it’s possible to connect to FTP servers, look through directories content, and download or upload files on and from server.
Data center is a center of data storage and processing, dedicated, high-tech and guarded bay where server and network hardware connected to the Internet is located.
Relational SQL databases allow to structure data storage and to build connections in it. Also they parallelize an access to it in case of simultaneous hits. It will be easier to organize your web-apps while possessing the necessary database number and types. SQL is a programming language which requires access to database through structured requests