A hike is generally a short walk on charted trails. A hike’s length is variable and can be a day trip or an overnight stay. Minimal supplies are needed.
However, a climb can vary in length but is typically more demanding than a hike. A climb has steep terrain and may involve using climbing equipment to scale the face of the mountain.
On the other hand, a trek is the longest type of journey on foot. It involves walking through challenging terrain for multiple days. Because of the length of treks, you need to bring supplies and food.