Box

Box (plural boxes) describes a variety of containers and receptacles for permanent use as storage, or for temporary use, often for transporting contents.

Boxes may be made of durable materials such as wood or metal, or of corrugated fiberboard, paperboard, or other non-durable materials. The size may vary from very small (e.g., a matchbox) to the size of a large appliance. A corrugated box is a very common shipping container. When no specific shape is described, a box of rectangular cross-section with all sides flat may be expected, but a box may have a horizontal cross section that is square, elongated, round or oval; sloped or domed top surfaces, or non-vertical sides.

A decorative or storage box may be opened by raising, pulling, sliding or removing the lid, which may be hinged and/or fastened by a catch, clasp, or lock.

Packaging box

Several types of boxes are used in packaging and storage.

Software

Computer software also called a program or simply software is any set of instructions that directs a computer to perform specific tasks or operations. Computer software consists of computer programs, libraries and related non-executable data (such as online documentation or digital media). Computer software is non-tangible, contrasted with computer hardware, which is the physical component of computers. Computer hardware and software require each other and neither can be realistically used without the other.

At the lowest level, executable code consists of machine language instructions specific to an individual processor—typically a central processing unit (CPU). A machine language consists of groups of binary values signifying processor instructions that change the state of the computer from its preceding state. For example, an instruction may change the value stored in a particular storage location in the computer—an effect that is not directly observable to the user. An instruction may also (indirectly) cause something to appear on a display of the computer system—a state change which should be visible to the user. The processor carries out the instructions in the order they are provided, unless it is instructed to "jump" to a different instruction, or interrupted.

Sky+ HD

Sky+ HD is the brand name of the HDTV service launched by Sky plc on 22 May 2006 in the United Kingdom and Ireland to enable high definition channels on Sky to be viewed. For the first 2 years after launch, the service was branded Sky HD. The service requires the user to have a Sky+ HD Digibox and an HD ready TV. Customers who pre-ordered by paying a deposit before 6 April 2006 were the first to receive the service, with installations starting on 21 May 2006.

As of 21 August 2014 the number of Sky+HD boxes currently in use stands at over 10 million.

Subscriptions

A subscription to the original HD pack carries an extra fee of £10.25 (€15.00 in Republic of Ireland) a month on top of the standard Sky subscription. This fee allows customers to view any HD channels which correspond to the channel packs they subscribe to. Thus, Discovery HD and National Geographic HD will only be available if you have the entertainment extra package in addition to HD. Before that someone without the Knowledge Pack (part of the Entertainment Extra as of September 2011, which corresponds to the Variety Pack) could not view the SD Discovery or National Geographic but they can view the HD versions. Additional Pay-Per-View events on Sky Box Office HD are not available to customers unless they subscribe to the Sky HD pack.

Set-top box

A set-top box (STB) or set-top unit (STU) is an information appliance device that generally contains a TV-tuner input and displays output to a television set and an external source of signal, turning the source signal into content in a form that can then be displayed on the television screen or other display device. They are used in cable television, satellite television, and over-the-air television systems, as well as other uses.

TV signal sources

The signal source might be an Ethernet cable, a satellite dish, a coaxial cable (see cable television), a telephone line (including DSL connections), broadband over power lines (BPL), or even an ordinary VHF or UHF antenna. Content, in this context, could mean any or all of video, audio, Internet web pages, interactive video games, or other possibilities. Satellite and microwave-based services also require specific external receiver hardware, so the use of set-top boxes of various formats has never completely disappeared. Set-top boxes can also enhance source signal quality.