Becoming a citizen of India is a process that is governed by the Citizenship Act of 1955. This act outlines the various ways in which an individual can become a citizen of India, even if they were born outside the country.

1. One way for an individual to become a citizen of India if they were born outside the country is through registration. This applies to individuals who are of Indian origin and have been residing in India for at least seven years before making the application. Additionally, they must also have lived in India for a total of at least seven years out of the preceding 12 years.
2. Another way for an individual to become a citizen of India if they were born outside the country is through naturalization. This applies to individuals who have been residing in India for at least 12 years before making the application. Additionally, they must also have lived in India for a total of at least 12 years out of the preceding 14 years.
3. There are also provisions for citizenship by descent, which applies to individuals born outside India to parents who are Indian citizens. In this case, the individual must register themselves as an Indian citizen within one year of becoming eligible to do so.

It's also worth mentioning that there are certain restrictions for certain categories of people. For instance, a person who is illegally staying in India, a person who has served in the armed forces of a foreign country, or a person who has been convicted of certain criminal offenses may not be eligible for Indian citizenship.

In conclusion, the Citizenship Act of 1955 provides various ways for individuals who were born outside India to become citizens of the country. This includes registration, naturalization, and citizenship by descent. However, it's important to meet the required criteria and also to note that there are certain restrictions for certain categories of people.