Keyword Difficulty.

Keyword difficulty (KD) is an estimate of how strong the competition for the organic top places of a keyword is. SEO tools usually express it as a number from 0 to 100: the higher the value, the more authoritative and established the pages already ranking, and the more effort a top position of your own will cost. It is a compass rather than a measurement, but a compass is precisely what most raw keyword lists are missing when the decision about where to start has to be made.

How the figure is calculated differs from tool to tool, but it is usually based on the strength of the domains and pages currently ranking, above all their backlink profile and authority. Treat it as orientation rather than an exact value, and always read it together with search volume, search intent and your own domain strength. Because every tool calculates differently, absolute numbers are only partly comparable; what is useful is the relative ordering within one and the same tool.

Strategically, keyword difficulty helps with prioritising. New or small websites sensibly start with keywords of low to medium difficulty, often long-tail, collect rankings, traffic and authority there, and work their way up to more contested terms afterwards. That way effort goes where it produces results within a foreseeable time frame, instead of into a fight that cannot be won on the authority currently available. The order of the work matters more than the ambition behind it.

An example. A young consultancy sees that «Unternehmensberatung» carries very high difficulty while «Nachfolgeberatung KMU Ostschweiz» sits low. Instead of taking on established players with no prospect of winning, it occupies the reachable, more specific keywords first, and builds step by step the authority the harder terms require. Two years later the same list can be reassessed, and terms that looked unrealistic then may well have moved into range in the meantime.