Which language most people using?

It's impossible to say definitively which language most people are using at any given moment, as language use is constantly changing.

However, we can talk about the languages with the largest number of speakers:

* Mandarin Chinese: With over 1 billion speakers, Mandarin Chinese is the language spoken by the largest number of people worldwide.

* English: With over 1.5 billion speakers, English is the most widely spoken language, considering both native and non-native speakers.

* Hindi: Spoken by over 600 million people, Hindi is the third most spoken language globally.

* Spanish: With over 500 million speakers, Spanish is the fourth most spoken language.

* Arabic: Spoken by over 400 million people, Arabic is the fifth most spoken language.

It's important to note that these numbers are estimates and can vary depending on the source. Additionally, language use is constantly evolving due to factors like globalization, technology, and migration.