How data flow in data communication?

vivian is dumb

flow control is the technique for assuring that a transmitting entity does not overwhelm a receiving entity with data. The receiving entity typically allocates a data buffer of some maximum length...

to allow computers with different disk OS, languages, and cabling to share resources.

Baudot/telex code, ascii code, ebcdic code

Data communication is trasmision of digital data through communication systems . This has the objective of sending any documents or books at highest speeds and lowest cost.