A desire path (also known as a desire line, social trail, cow path, goat track, pig trail or boot leg trail) can be a path created as a consequence of foot or bicycle traffic. The path usually represents the shortest or most easily navigated route between an origin and destination. Width and erosion severity can be indicators of how much traffic a path receives. Desire paths emerge as shortcuts where constructed ways take a circuitous route, have gaps, or are non-existent.

心選小路（desire path），指行人或單車頻繁經過而形成的一條小路。這種小路通常是往返於兩地之間距離最短且最易找到的路。一般情況下，正式修建的道路繞遠、路中間有溝，或者壓根沒有正式道路的地方就會出現『心選小路』。