Migration may happen for many different excuses. The excuses may be classified as social, political or environmental so it's easier for us to classify them. Economical migration is when you move to find work or any career path or for further studies. Social migration is moving somewhere close to your relatives or friends for more publicity and for becoming more socialized. Political migration is when you escape from political issues like wars, crime or inproper government. Environmental migration is when you want to get rid of natural diasters like the HudHud. People migrate due to these streams.