Human mobility can be categorized in a variety of ways. For example, mobility flows can be separated in terms of the distance of the movement, the length of time spent moving, the reasons for the movement, or by the outcome of the mobility. People may be displaced, meaning, they have little choice but to move, or they may choose to move. They may be prevented from moving despite wanting to: often referred to as trapped populations. Migrants can move seasonally, temporarily, or permanently. Their decisions to move might be influenced by social and kin relationships, or by the desire to avoid persecution or conflict or for perceived better and/or more secure lives or livelihoods.