By native speakers:
* Mandarin Chinese is the most spoken language with over 1 billion native speakers.
By total speakers:
* English has the largest number of total speakers, including native and non-native speakers, at over 1.5 billion.
By internet users:
* English is the dominant language on the internet, accounting for about 55% of all internet content.
By international communication:
* English is the most commonly used language in international communication, especially in fields like business, diplomacy, and science.
So, the answer depends on the specific metric you're considering. If you're looking at native speakers, Mandarin Chinese is the most used. If you're looking at total speakers or internet users, English takes the lead.