It is known as track to the vestige , signal or indication that allows to advance in a investigation . Clues are certain information that, once discovered or warned, serves to infer or infer new data .
For example: "The detective found important clues at the crime scene", "They left me an anonymous message under the door and I have no clue as to who the author might be", "The perfect crime does not exist: there is always some clue that the investigator can analyze to discover the truth".
A clue can also be a collaboration or one help that is given to another person In certain contexts. The intention of the one who contributes the clue is that your interlocutor manages to discover something on his own, without having to give him the complete answer.
These types of tracks can be supplied within the framework of a game (a father who hides a surprise gift for his son and gives clues to discover his location) or a evaluation (A teacher who provides clues to a student so that he remembers certain data and can answer the questions on an exam).
The clues, in another sense, are Physical spaces that are delimited so that they can fulfill a specific function. You can talk about race tracks , airstrips , dance floors , etc.: "The German runner has already won five times on this track", "The pilot could not locate the track due to the fog and decided to postpone the landing".
A clue, finally, can be a band which is part of a disk or magnetic tape. These tracks contain data independently that, when gathered, give a whole work.