What is deportation?
Deportation is actually the removal of foreigners from the country. Why a country deports foreigners depends upon many factors. A country has excessive foreign employees; criminal activities are increasing day by day and due to security threat.

If someone entered the country illegally without visa and later it was revealed, you are engaged in any fraudulent activity and are violating the laws of country, the country has the right to deport the person.

Even if you have entered the country legally, if there, you are engaged in any fraudulent activity, you will be deported from the country.

There are many other causes why a country deports someone. They include but not limited to:
Someone has bad health and has fatal diseases that may prevail throughout the country, someone has relation with terrorists gang and may perform terrorist act, one has no immigrant visa and has no proper reason of its stay in the country, one is political or defense agent to spy the information, it was proved that he has no good reputation in their native country, one has no sufficient financial resources and any person who violate country laws in any way.

How to avoid deportation:
To avoid deportation, always enter the country legally and be honest. Do not violate country laws, and it is necessary to know what specific laws of a country are.