Walking, hiking, and rambling are all forms of physical activity that involve moving on foot, but there are some differences between them:

1. Walking: Walking is the most basic and common form of physical activity that involves moving on foot. It can be done at a leisurely pace or at a faster speed, and can be performed on flat or uneven terrain. Walking is a low-impact activity that is accessible to most people, and it can be done as a form of exercise, for transportation, or for leisure.

2. Hiking: Hiking involves walking on trails or paths that are typically unpaved and often in a natural setting, such as a forest, mountains, or hills. Hiking can be more challenging than walking, as it often involves uphill and downhill sections, and may require more stamina and endurance. Hiking can be done as a form of exercise, for recreation, or as part of outdoor activities such as camping or backpacking.

3. Rambling: Rambling is a term used primarily in the UK to describe long walks in the countryside, often on footpaths and bridleways. Rambling is similar to hiking but may involve a more relaxed pace, and may be more focused on enjoying the scenery and the outdoors rather than achieving a specific fitness goal. Rambling is often done in groups, and may be part of a social or community activity.