Visa applications procedure are complex and take time.
There is a long list of information required (e.g listing every country that applicant has visited over the past 05 (five) or 10 (ten) years). The applicant may also need to travel to a consulate or embassy for an interview, or courier passport to the consulate or embassy and not receive it back for several weeks.
Due to political circumstances, citizens of many countries find it difficult to travel abroad and are confronted with strict visa restrictions each time they want to enter a foreign country
The benefit of having a second Passport
If for some reason you cannot get or renew a passport in your home country (e.g. political instability, civil war, etc.), the second passport that you have will be critical. Even if you simply lose your original passport, it may take some time until you can get a replacement. In such a situation holding a second passport may be the difference between life and death.
A citizenship and a passport, particularly from a small, peaceful country, can even save your life when travelling and in times of political unrest, civil war, terrorism or other delicate situations. For good reasons, many international business people and important persons who are active worldwide consider an alternative passport as the best life insurance money can buy.
People can become dual citizens automatically by birth within a certain territory (e.g. the United States), by descent from a citizen parent, or marriage, or after successfully applying for the citizenship of another country.
Subject to individual national legislation you can become a citizen of another country without losing your current citizenship, but only if the laws of the country of your current citizenship allow dual/multiple citizenship.. Singapore, for example, is a strictly single-citizenship country and will require proof of relinquishment of all other citizenships the applicant holds.
Principal grounds for acquiring citizenship are birth within a certain territory, descent from a citizen parent, marriage to a citizen, and naturalization. The conditions under which the privilege of grant of citizenship or naturalization is given vary from state to state, but family relationships or lengthy periods of residence are usually essential, besides character and other requirements such as knowledge of the national language.