Yes is type of communication
synchronous
Yes. It is operating in synchronous with the clock. Two wire communication. SDA, SCL and GND pins.
voicemail
voicemail
Written. or text.
Email should be written communicationCalls Should be spokenall the text related communication would be written communication
voicemail
Asynchronous vs. Synchronous Communication
Electronic communication is the use of electronic devices or electronic waves such as cellphones, email, talkie-walkies, sending and receiving radios etc.
No, someone doesn't have to be there at the same time as you for you to send them a message.
There is no "type". Almost everybody on the Internet uses email these days. The majority of things on the Internet require people to have an email account. Email is mostly used for communication, since it is short for "electronic mail".
Synchronous just means "at the same time," so the difference is basically between immediate forms of communication. Here are some examples:Asynchronous communication:EmailMessage BoardsLettersBlogsVideo or Music recordingsOnline discussion boardsSynchronous communication:Phone callsAudio and Video conferencesIn person concertsInstant messaging / chatIn-person conversations / meetingsClearly the synchronous method is much faster, but the method that is best for a specific communication depends on the circumstances.