A tradition is a combination of different pratices, customs, and myth that is memorized and passed down from generation to generation. It doesn't necessary to be record down in words system. Tradition is a sytem of knowledge or a means of transferring knowledge. According to economists Friedrich Hayek and Thomas Sowell, they explained that tradition is an economically efficient way to transfer and obtain knowledge of all kinds. Traditions are often presumed to be ancient, unalterable, and deeply important, though they may sometimes be much less "natural" than is presumed. According to an article in Wikipedia, some examples include "the invention of tradition" in Africa and other colonial holdings by the occupying forces. Requiring legitimacy, the colonial power would often invent a "tradition" which they could use to legitimize their own position. For example, a certain succession to a chiefdom might be recognized by a colonial power as traditional in order to favour their own candidates for the job. Often these inventions were based in some form of tradition, but were grossly exaggerated, distorted, or biased toward a particular interpretation. It is interesting that the idea of tradition is important in philosophy. According to Wikipedia, Twentieth century philosophy is often divided between an 'analytic' tradition, dominant in Anglophone and Scandinavian countries, and a 'continental' tradition, dominant in German and Romance speaking Europe.
That's about it.
參考: Polanyi, M (1964) Personal Knowledge: Towards a Post-Critical Philosophy. Sowell, T (1980) Knowledge and Decisions Basic Books.