Step 1: Understanding the Concept:
A news agency (or wire service) provides news reports to subscribing newspapers, magazines, and broadcasters.
Step 2: Detailed Explanation:
The Press Trust of India (PTI) is the oldest and largest news agency in India.
It was registered on August 27, 1947, taking over the operations of the Associated Press of India and the Indian operations of Reuters.
It officially started functioning in February 1949.
It is a non-profit cooperative of Indian newspapers.
United News of India (UNI) was established later in 1961.
Step 3: Final Answer:
PTI is the oldest and largest news agency.