International migration is when people go to live in foreign countries, especially in order to find work. Most global migration is from developing countries to developed ones.
Pull Factors are factors that attract people to move to a new location. Occur within receiving countries (i.e. countries people come to), usually positive opportunities.
Work opportunities abroad, favorable migration policy, good benefits and high compensation, similarity of culture and language in the country of destination, etc., are examples of Pull Factors
Cost of travel, ease of communication, international business trends, free flow of information, faster and lower cost transportation Social networks (e.g. family and personal ties) are examples of Network Factors.
Illegal migration increases job competition in the receiving country: influx of migrants can lead to conflicts with local residents in terms of job availability
Authors believe that there are negative impacts when a country tightens border controls: leads to illegal migrants adopting more dangerous ways to enter a country; illegal migrants who would leave the country would be "locked in" the country