Britain's ouster from the European Union, commonly known as Brexit, was a landmark event stemming from a referendum held in June 2016, where 51.9% of voters chose to leave the EU. The decision was driven by a complex mix of factors, including concerns over national sovereignty, control over borders and immigration, and a desire to escape EU regulations and contributions to the bloc's budget. The formal process of leaving was triggered by invoking Article 50 of the Treaty on European Union in March 2017, leading to a period of intense negotiations on withdrawal terms and a future relationship agreement. The UK officially left the EU on January 31, 2020, followed by a transition period that ended on December 31, 2020, after which new trade and cooperation agreements came into effect.

Consequences on the World Economy in General:

1. Increased Uncertainty and Volatility: Brexit introduced significant political and economic uncertainty, leading to fluctuations in financial markets, particularly the British pound, and impacting investor confidence globally.
2. Trade Disruptions: New customs checks, regulatory divergences, and non-tariff barriers between the UK and the EU have disrupted supply chains, increased costs for businesses, and reduced trade volumes, affecting global trade flows.
3. Impact on EU's Economic Strength: The departure of a major economy like the UK weakened the EU's overall economic output and political influence on the global stage, potentially affecting its ability to negotiate trade deals and respond to crises.
4. Precedent for Other Countries: Brexit raised concerns about the potential for other member states to consider leaving the EU, threatening the stability and future of the bloc.
5. Shift in Global Power Dynamics: It led to a re-evaluation of alliances and trade relationships, with countries like the US, China, and India seeking to forge new bilateral agreements with the UK.

Consequences on India in Particular:

1. Trade Opportunities and Challenges: Brexit opened the door for India and the UK to negotiate a comprehensive Free Trade Agreement (FTA), potentially boosting bilateral trade and investment. However, it also meant that Indian businesses previously using the UK as a gateway to the EU market faced new barriers and had to adapt their strategies.
2. Investment Flows: While some Indian companies with significant investments in the UK faced initial uncertainty, others saw opportunities in a more independent UK. Conversely, UK investments into India might be influenced by the UK's new economic priorities.
3. Services Sector Impact: India's strong services sector, particularly IT and financial services, faced both challenges and opportunities. New visa regimes and regulatory frameworks could affect the movement of Indian professionals, while new bilateral agreements might create fresh avenues.
4. Currency Volatility: The initial depreciation of the British pound post-Brexit caused some short-term volatility for the Indian Rupee and affected remittances from the UK.
5. Geopolitical Realignment: Brexit encouraged the UK to strengthen its ties with countries in the Indo-Pacific region, including India, aligning with India's strategic interests in a multipolar world. This has led to enhanced cooperation in defense, security, and technology.