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In the fictional Star Trek universe, a replicator is a machine capable of creating (and destroying) objects. Replicators were originally seen used to synthesize meals on demand, but in later series, they are used for lots of other things.

The term "replicator" originated on Star Trek: The Next Generation, portrayed as a 24^th century advancement from the 23^rd century "food slots" seen in Star Trek: The Original Series. The mechanics of these devices were never clearly explained on that show, but the subsequent prequel series, Star Trek: Enterprise, featured a 22^nd century version referred to as a "protein resequencer." Additionally, that ship had a "bio-matter resequencer" which was used to recycle waste product into usable material. ^[1]

A replicator can create any inanimate matter, as long as the desired molecular structure is on file, but it cannot create antimatter, dilithium, or a living organism of any kind. Gold-pressed latinum, the unit of intrinsic currency in the Ferengi worlds, has a particular molecular structure that cannot be replicated exactly without being detected as counterfeit.^{[citation needed]}

A replicator works by rearranging subatomic particles, which are abundant everywhere in the universe, to form molecules and arrange those molecules to form the object. For example, to create a pork chop, the replicator would first form atoms of carbon, hydrogen, nitrogen, etc., then arrange them into amino acids, proteins, and cells, and put it all together into the form of a pork chop.

This process requires the destructive conversion of bulk matter into energy and its subsequent reformation into a pre-scanned matter pattern. In principle, this is similar to the transporter, but on a smaller scale. However, unlike transporters, which duplicate matter at the quantum level, replicators must be capable of a large number of different materials on demand. If patterns were to be stored at the quantum level, an impossible amount of data storage (or a set of original copies of the materials) would be required. To resolve this, patterns are stored in memory at the molecular level.

The drawback of doing so is that it is impossible to replicate objects with complicated quantum structures, such as living beings, dilithium, or latinum. (However, in the TNG episode "Allegiance", the aliens used their replicators to create a Picard imposter.) Additionally, read/write errors cause a number of single-bit errors to occur in replicated materials. Though usually undetectable to human senses, computer scanning can be used to reveal these discrepancies, and they may explain the frequent complaint (by some gourmets and connoisseurs) that replicated food and beverages suffer from substandard taste. These errors also may cause a nontoxic material to become toxic when replicated.

One of the most important pieces of technology in the Star Trek universe, the replicator is used primarily to provide food and water onboard starships, thus eliminating the need to stock most provisions. (Starships, starbases, and other installations stock some provisions for emergency use, in case of replicator failure or an energy crisis.) On Star Trek: Deep Space Nine, it was established that replication is also used to provide breathable air on ships and starbases (and to disassemble the carbon dioxide exhaled by the crew), thus providing an endless supply of oxygen and eliminating the need to carry air tanks.

The technology is also used for producing spare parts, which makes it possible to repair most ship damage without having to return to a starbase. The quantum resolution factor, however, precludes the mass production of the highest yielding weapons, such as quantum torpedoes.^{[citation needed]} Other applications include replication of Starfleet uniforms, as well as everyday objects such as toys and souvenirs. Replication is also used by the Holodeck program to allow food, clothes and other objects belonging within a simulation to be used or consumed by the participants.

Starfleet's safety protocols prevent unauthorized replication of dangerous objects, such as weapons and poisonous substances. Replication of any medicine is restricted to medical personnel bearing a valid identification code.^[2]

Replicators can also convert matter into energy. Following that principle, the device can dismantle any object into subatomic particles. The ensuing energy can then be stored for future use or immediately applying in a subsequent replication. This process is referred to as "recycling", and is applied to everything from dirty dishes to outgrown children's clothes; in the case of the latter, the replicator uses the energy to produce new items that will fit the child.

Kathryn Janeway regards a replicator on Voyager.

When the USS Voyager was pulled to the Delta Quadrant, it became clear that replicator technology was unknown to the indigenous peoples of that region. Throughout the first seasons, the Kazon and other races tried repeatedly to obtain the technology. Captain Janeway feared that if this technology were acquired by a civilization before they were ready, disastrous consequences could ensue (on one occasion a ship was destroyed when its crew tried to construct a replicator). For this reason, and because of the Prime Directive, Janeway refused to give away the technology at any price.

Also on Voyager, the ship's energy constraints on the journey back to the Alpha Quadrant meant that replicator supplies had to be strictly controlled, leading to "replicator rations" becoming an unofficial ship currency. This is also the reason Neelix (aside from providing the crew with a morale boost through the preparation of fresh food) became employed as the ship's chef. Ingredients came from the ship's hydroponics laboratory.

• Replicator article at Memory Alpha, a Star Trek wiki
• "Transporters, Replicators and Phasing FAQ" by Joshua Bell