Which largest population that uses English as a second language?

It's difficult to definitively say which country has the largest population of English as a second language (ESL) speakers. This is because:

* Data collection and definition vary: Different sources use different criteria for defining "ESL" and collecting data.

* English proficiency levels are diverse: Some countries may have a large number of people who have some exposure to English but are not truly fluent.

However, based on available data and estimates, the following countries are often cited as having a large number of ESL speakers:

* India: With a population of over 1.3 billion, India has a significant number of people who use English as a second language, primarily for education and business.

* China: China's population is around 1.4 billion, and English is widely taught in schools and used in many industries.

* Pakistan: With a population of over 200 million, Pakistan also has a large English-speaking population.

* Nigeria: Nigeria's population is around 200 million, and English is the official language.

* Philippines: English is a common language in the Philippines, where it is widely used in government, education, and business.

It's important to note that these are just estimates, and the actual number of ESL speakers in each country could be higher or lower.