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The word is sometimes used synonymously with " transaction"; in some cases, a difference between the two should be distinguished.

Examples include: the interaction between a driver and the position of his or her car on the road: by steering the driver influences this position, by looking this information returns to the driver; the feedback during operation of other machines such as a computer or a tool; two people talking to each other (sometimes the interaction is not satisfactory, because one or both do not listen well).

In communications, interactive communication occurs when sources take turns transmitting messages between one another. This should be distinguished from transactive communication, in which sources transmit messages simultaneously.

In medicine, most medications can be safely used with other medicines but particular combinations of medicines need to be monitored for interactions, often by the pharmacist.

Interactions between drugs fall generally into one of two main categories; pharmacodynamic (involving the actions of the two interacting drugs), and pharmacokinetic (involving the absorption, distribution, metabolism, and excretion of one or both of the interacting drugs upon the other).

Sometimes two or medications are used together to create an extra effect - e.g. two different pain killers to provide more complete pain control. These interactions are usually intentional but need to be monitored by the doctorDoctor means teacher in Latin. It has been used continuously as an honored academic title for over a millennium in Europe, where it dates back to the rise of the university. This use spread to the Americas, former European colonies, and is now prevalent i because patients can end up with more effect than is actually required. Sometimes two or more medications work against each other. These interactions are usually well-known and avoided unless both medicines are essential. Careful monitoring is used to prevent problems from the results of the interaction.

Other interactions may cause one medicine to have less or more effect than expected and these are usually managed by a dosage adjustment .

In physicsPhysics (from the Greek, physikos , "natural", and physis , "Nature") is the science of Nature in the broadest sense. Physicists study the behavior and properties of matter in a wide variety of contexts, ranging from the sub-microscopic particles from whi, an interaction specifically refers to the action of one physical object upon another - the physical objects under consideration may range from pointThe word point can refer to: a location in physical space a unit of angular measurement; see navigation point is a typographic unit of measure in typography equal inch or sometimes approximated as inch; on computer displays it should be equal to point in particles to quantum fields. For example, the interaction of charged particles takes place through the mediation of the electromagnetic field whereas beta decay occurs by means of the weak interaction. There are believed to be four fundamental interactions in nature.