Titres refer to the quantitative measure of a substance's concentration in a solution. In scientific literature, titres are often referred to using alternative terms such as titer, titre value, and concentration. The term titer is a more commonly used alternative among scientists and is commonly used in diagnostic testing procedures. Other synonyms used to refer to titres include antibody titer and microbial titer. Concentration is another term that can be used interchangeably with titres but is more commonly used to describe the volume of solutes in a solution rather than the concentration of a specific substance. Regardless of the term used, titres are an essential component of many experimental protocols and are used to determine the critical values of specific substances in various types of solutions.