Whois & Analysis for engrade.com

Electronic mail, or email, is a method of exchanging digital messages between people using digital devices such as computers and mobile phones.

Email first entered substantial use in the 1960s and by the mid-1970s had taken the form now recognized as email.

Email operates across computer networks, which today is primarily the Internet.

Some early email systems required the author and the recipient to both be online at the same time, in common with instant messaging.

Today's email systems are based on a store-and-forward model.

Email servers accept, forward, deliver, and store messages.

Neither the users nor their computers are required to be online simultaneously; they need to connect only briefly, typically to a mail server or a webmail interface, for as long as it takes to send or receive messages.

In music, sampling is the act of taking a portion, or sample, of one sound recording and reusing it as an instrument or a sound recording in a different song or piece.

Conversation is a form of interactive, spontaneous communication between two or more people.

Typically, it occurs in spoken communication, as written exchanges are usually not referred to as conversations.

McGraw-Hill Education (MHE) is an American learning science company and one of the "big three" educational publishers is a part of MCGRAW-HILL RYERSON LIMITED that provides customized educational content, software, and services for pre-K through postgraduate education.

The company also provides reference and trade publications for the medical, business, and engineering professions.

McGraw-Hill Education currently operates in 28 countries, has more than 4,800 employees globally, and offers products and services to over 135 countries in nearly 60 languages.

An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the power of a signal (a time-varying voltage or current).

An amplifier functions by taking power from a power supply and controlling the output to match the input signal shape but with a larger amplitude.

In this sense, an amplifier modulates the output of the power supply based upon the properties of the input signal.

An amplifier is effectively the opposite of an attenuator: while an amplifier provides gain, an attenuator provides loss.