the quiet machinery that decides what goes first, and by what religion.
means a sorting system is any fixed set of rules for arranging items into meaningful order, so you can find, compare, or process them fast.
from the impulse is ancient: librarians alphabetizing scrolls, merchants stacking coins by weight, but the formal theory exploded with computing, when sorting a list became the single most studied problem in algorithm design, spawning bubble sort, quicksort, mergesort, and decades of academic bloodsport over which was fastest.
dewey decimal system — melvil dewey, 1876, still shelves most public libraries
quicksort — tony hoare invented it in 1959, still python's cousin
periodic table — mendeleev sorted elements by atomic weight in 1869
post office zip codes — 1963 usps system sorts mail by five digits