Activation can have various meanings depending on the context, but generally, it refers to the process of turning something on or making it operational. Here are a few examples of how activation can be used:

1. Marketing: In marketing, activation refers to the process of engaging consumers with a brand or product to drive a specific action, such as a purchase or sign-up. This can involve various tactics, such as experiential marketing, social media campaigns, or loyalty programs.
2. Technology: In the context of technology, activation can refer to the process of activating software or hardware by entering a license key or completing a registration process. This allows users to access the full functionality of the product.
3. Security: In the context of security, activation can refer to the process of verifying a user’s identity or granting access to a system or network. This is often done through the use of authentication methods, such as passwords or biometrics.

Overall, activation typically involves taking a specific action to initiate a process or enable a particular function.

Broadcasting is the distribution of audio and/or video content to a dispersed audience via any electronic mass communications medium, but typically one using the electromagnetic spectrum (radio waves), in a one-to-many model.

The term “broadcasting,” derived from the method of sowing seeds in a field by casting them broadly about, originated in the early days of radio to distinguish radio broadcasting from methods using wired transmission (as in telegraph and telephone) or that were intended as person-to-person communication. Broadcasting is usually associated with radio and television, though in practice radio and television transmissions take place using both wires and radio waves.

The receiving parties may include the general public or a relatively small subset; the point is that anyone with the appropriate receiving technology can receive the signal. The field of broadcasting includes a wide range of practices, from relatively private exchanges such as amateur (ham) radio and amateur television (ATV) and closed-circuit TV, to more general uses such as public radio, community radio, and commercial radio, public television, and commercial television.

Transmission of radio and television programs from a radio or television station to home receivers over the spectrum is referred to as OTA (over the air) or terrestrial broadcasting and in most countries requires a broadcasting license. Transmissions using a combination of satellite and wired transmission, like cable television (which also retransmits OTA stations with their consent), are also considered broadcasts and do not require a license. Transmissions of television and radio via streaming digital technology have increasingly been referred to as broadcasting as well, though strictly speaking this is incorrect.

Pitch is a perceptual property that allows the ordering of sounds on a frequency-related scale. Pitches are compared as “higher” and “lower” in the sense associated with musical melodies, which require sound whose frequency is clear and stable enough to distinguish from noise.

Pitch is a major auditory attribute of musical tones, along with duration, loudness, and timbre. Pitch may be quantified as a frequency, but pitch is not a purely objective physical property; it is a subjective psychoacoustical attribute of sound.

Historically, the study of pitch and pitch perception has been a central problem in psychoacoustics and has been instrumental in forming and testing theories of sound representation, processing, and perception in the auditory system.

Holography is a technique that enables three-dimensional images (holograms) to be made. It involves the use of a laser, interference, diffraction, light intensity recording, and suitable illumination of the recording.

The image changes as the position and orientation of the viewing system change in exactly the same way as if the object were still present, thus making the image appear three-dimensional. The holographic recording itself is not an image; it consists of an apparently random structure of either varying intensity, density, or profile.

The Metaverse is a collective virtual shared space, created by the convergence of virtually enhanced physical reality and physically persistent virtual space, including the sum of all virtual worlds, augmented reality, and the internet.

The word metaverse is a portmanteau of the prefix “meta” (meaning “beyond”) and “universe” and is typically used to describe the concept of a future iteration of the internet, made up of persistent, shared, 3D virtual spaces linked into a perceived virtual universe.

The term was coined in Neal Stephenson’s 1992 science fiction novel Snow Crash, where humans, as avatars, interact with each other and software agents, in a three-dimensional space that uses the metaphor of the real world. Stephenson used the term to describe a virtual reality-based successor to the Internet.

Concepts similar to the Metaverse have appeared under a variety of names in the cyberpunk genre of fiction as far back as 1981 in the novella True Names. Stephenson stated in the afterword to Snow Crash that after finishing the novel he learned about Habitat, an early MMORPG which resembled the Metaverse.