What are the advantages and disadvantages of it?

In which part of a professional email should you try to be brief, but highly descriptive?

What is estimated time of arrival (eta)? a device that measures the acceleration (the rate of change of velocity) of an item and is used to track truck speeds or taxi cab speeds a gps technology adventure game that posts the longitude and latitude location for an item on the internet for users to find a north/south measurement of position the time of day of an expected arrival at a certain destination and is typically used for navigation applications

Explain how email technologies enable the exchange of messages between users. find out the typical parts of an email address and explain each part.