Tamil. Among all Dravidian languages, it is Tamil which is most followed & used for communication by people of other languages, by a big margin. Apart from Tamilnadu, in Major cities of other south indian states, Tamil is the most follwed & used language, for communication, next to that state's official language and Hindi.
In other parts of our country too, Tamil is the most known Dravidian language.
In countries like Singapore, Malasia, Srilanka, Mauritius and even in Japan Tamil is the most used Indian Language. Tamil is an official language in Singapore & Srilanka. Tamil is the only Indian language which is an official language in other countries.
Telugu is the most spoken dravidian language in india and so many people mistook with hindi as the most spoken dravidian language!! But it is not so, though hindi is the most spoken language in india but it is not dravidian, it is Indo-Aryan(some say Indo-Persian) If there are any grammatical mistakes in my answer, sorry for those!
The Dravidian language is used in numerous countries. They language is spoken in India, Pakistan, Nepal, and Malaysia.
Kannada is a Dravidian language spoken in southern India by Kannadigas, people of Karnataka state.
Tamil, by a huge margin. Among all dravidian languages, its Tamil which is spoken most by people of other dravidian languages and people of other Indian languages. Looking worldwide, apart from Tamilians in India, countries like Malasia, Singapore, Srilanka & Mauritius have Tamilians. Also Tamil is a National / Admin language in these countries.
Telugu is a Dravidian language, primarily spoken in the Indian state of Andhra Pradesh.
It is a language from India called Telugu. It is a Dravidian language spoken by the Telugu in south-eastern India.
Kannada is a Dravidian language spoken in southern India by Kannadigas, the people of Karnataka state. Samooha madyama translated means medium group.
The language spoken by most people in the world is Mandarin Chinese. It is the official language of China and is spoken by over a billion people globally.
Tamil is a Dravidian language spoken by people of North-east Sri Lanka and South India. In Tamil you say friend as "Nanban" .
"The Dravidian language family includes approximately 85 genetically related languages, spoken by about 217 million people. They are mainly spoken in southern India and parts of eastern and central India as well as in northeastern Sri Lanka, Pakistan, Nepal, Bangladesh, Afghanistan, Iran, and overseas in other countries such as Malaysia and Singapore." - Wikipedia
The language used by the most people is 1 Chinese followed by 2 English then 3 Spanish.
Over 100 million people. They are related to Malayalam, Kannada, Tulu, and Telugu. It is spoken mostly in Tamil Nadu. It is an official language in three different states of India, Singapore and northeastern of Sri Lanka. It is a Dravidian language.