Real-time and asynchronous communication:

1. Real-time in-person meetings and remote synchronous interactions when parties are engaged at the same time;
2. Asynchronous textual and multimedia message exchange.

Service is the action of helping or doing work for a person or a group.

Meeting is an act of coming together with a purpose purposes in various environments.

Real objects produced by hand or print, as well as digital goods and virtual services.

Prices and transactions. Pricing policy.

Format is the shape, size, and general makeup of data, organization, arrangement, or choice of material, a method of organizing information.

Multimedia is a combined use of several media, integration of different media types like text, graphics, video, and sound.