Simplistically, the American Productivity & Quality Center (APQC) poses benchmarking (BM) as: "the practice of being humble enough to admit that others may have better processes and wise enought to learn how to match or even surpass them."
Formally, BM in business is both a commitment to a cultural mind set of continuing self-improvement and a formal structure of analytical tools & procedures for identifying "best practices", gathering data, and making internal measurable comparisons and/or adjustments in areas of performance, processes, solvency, or operations when compared to "peers" or other business/industry sectors. BM defines a point(s) of reference and identifies attributes of measureable metrics & ideals informing that value, and takes measures against them for comparative purposes. Gathered data might be quantitative or qualitative such as surveys of attitudes or opinions.
Operationally,the process of BM, in short, is viewed as:
For more insight about benchmarking, see these brief overviews:
Benchmarking by Sara Weiner in the Encyclopedia of Industrial & Organizational Psychology, 2007
Benchmarking by Su Dahlgaard-Park in Sage Encyclopedia of Quality and the Service Economy, 2015.