Trekking or Backpacking is the outdoor recreation of carrying gear on one’s back, while hiking for more than a day. It is often but not always an extended journey, and may or may not involve camping outdoors. In North America tenting is common, where simple shelters and mountain huts found widely in Europe are rare. In New Zealand, tramping is an equivalent term though overnight huts are frequently used. Hill walking is the equivalent in Britain, though backpackers make use of all kinds of accommodation, in addition to camping. Backpackers use simple huts in South Africa. Similar terms used in other countries are trekking and bushwalking.
Based on the definition found on Wikipedia: https://en.wikipedia.org/wiki/Backpacking