An analyte is a substance or chemical constituent that is of interest in an analytical procedure. It is the chemical species whose properties are being measured in an analytical chemistry experiment. Analytes can be chemical substances such as NaCl, water, or 24 karat gold, or they can be bacteria, yeast, fungus, or toxins. Analytes can be found and measured in various samples, such as blood, urine, or cannabis. Analytical chemists are interested in measuring the concentration of an analyte present in a sample, which is a quantitative observation. The term "analyte" is used in various fields, including chemistry, clinical chemistry, and law.