India has been working to establish diplomatic relationships with various countries for years. These agreements have been made to strengthen the economic and strategic ties of India with other nations. When two or more countries come together to sign a formal agreement, it is referred to as a treaty or an accord. These agreements govern international relations and are often seen as the backbone of diplomatic affairs. Here are some of the most important agreements between India and other countries:

1. India-US Nuclear Deal: This deal was signed in 2008 and was designed to facilitate the transfer of civilian nuclear technology to India. The agreement ended a three-decade ban on nuclear trade with India and significantly improved the diplomatic relationship between the two nations.

2. India-Japan Comprehensive Economic Partnership Agreement (CEPA): This agreement was signed in 2011 and aimed to expand trade between India and Japan. The CEPA includes the reduction of tariffs on various goods and services, the establishment of a mechanism to address trade issues, and more.

3. India-UK Bilateral Investment Treaty: This agreement provides a framework for investment and investment protection between India and the United Kingdom. The agreement encourages foreign investment and enhances economic cooperation between the two countries.

4. India-Russia Agreement on the prevention of incidents at sea: This agreement was signed in 2003 and aims to prevent incidents at sea between the two nations` navies. The agreement was designed to minimize maritime tensions and provide a mechanism for resolving disputes.

5. India-Australia Civil Nuclear Agreement: This agreement was signed in 2014 and was designed to facilitate the transfer of nuclear technology to India. The deal encouraged civil nuclear cooperation and strengthened the economic and strategic ties between the two countries.

In conclusion, the above mentioned agreements between India and other countries are of great significance to the diplomatic, economic, and strategic relations between India and other countries. These agreements have helped India expand its trade ties, reduce tensions, and improve the overall diplomatic relationship with other nations. It is important to note that, in the future, India will continue to form agreements with other countries to further its interests and promote international cooperation.