Basically, association is the process in which a relationship is found between two objects, either by a similarity that they present, such as the same origin, the same physical or mental characteristics, as well as belonging to the same place.
The term comes from the word "associate" and the suffix tion, being the action and effect of associating. For its part, the phrase free association is a psychoanalytic technique created by Sigmund Freud, for the in-depth knowledge of the subconscious of an individual, in order to determine what his psychological situation would be, in addition to analyzing and approaching what would be the true subject's personality.
Meanwhile in Law, association has four variants: free association, a human right that allows a person to create different organizations or societies, without any restriction of law (except if the movement violates it); the association is defined as any group formed by legal persons, which pursues the same goal or purpose; voluntary association occurs when a group of people come together, as part of their private right, of their own free will; Finally, political association is the situation in which two nations collaborate with each other or come together to achieve different ends. There is also the association of ideas and behavior.
In economics, it is the union of two or more individuals as the art of acts of a financial nature. In botany, the term is used to designate the different species that are named with a variation of the names of another dominant species that is present in their genetic makeup.