* "Second language" is not a clearly defined term. It can mean the language most people are fluent in after their native language, or it could mean the language used for official purposes, education, or business.
* Language use varies within a country. Even within a country, the prevalence of English can differ greatly between regions, cities, and demographics.
However, here are some general categories of countries where English is widely spoken, often as a second language:
* Former British colonies: Many countries previously under British rule have a strong legacy of English, often used in government, education, and commerce. Examples include India, Pakistan, Nigeria, Kenya, Australia, Canada, and many Caribbean nations.
* Countries with significant English-speaking populations: Countries like South Africa, Singapore, and the Philippines have large English-speaking communities due to historical or economic factors.
* Countries with English as a language of instruction: Many countries use English as the medium of instruction in higher education, leading to a higher level of English proficiency among the educated population. Examples include many countries in Asia and Africa.
It's important to note: The level of English proficiency can vary widely within these countries. While some individuals might be fluent, others might have limited knowledge or none at all.
If you're interested in the prevalence of English in a specific country, you could consult resources like the Ethnologue database or the EF English Proficiency Index which provide insights into language use and proficiency levels.