A government formed by the coming together of at least two political parties is known as a coalition government. Usually partners in a coalition form a political alliance and adopt a common programme.

Congress led coalition government is UPA whereas BJP led coalition is known as NDA.

A coalition government is a type of government that is formed by two or more political parties coming together to govern. It is formed when no single party is able to secure a majority in the elections. In a coalition government, the parties involved agree to work together and share power in order to form a stable government.

The correct answer is option 'C', which states that the government is formed by two or more parties coming together. This means that in a coalition government, multiple parties join forces and work together to form a government.

Explanation:
1. Definition of Coalition Government:
- A coalition government is a form of government where political parties with different ideologies or interests come together to form a governing majority.
- It is typically formed when no single party is able to secure a majority in the elections.

2. Formation of Coalition Government:
- In a coalition government, two or more parties form an alliance and agree to work together to form a government.
- These parties negotiate and agree on a common agenda and share power and responsibilities.

3. Purpose of Coalition Government:
- The purpose of a coalition government is to provide stability and ensure effective governance when no single party has enough seats to form a government on its own.
- It allows different parties to come together and bring their diverse perspectives and ideas into the decision-making process.

4. Advantages of Coalition Government:
- Coalition governments can represent a broader range of interests and perspectives since multiple parties are involved.
- They can promote consensus-building and compromise, as parties need to work together to achieve common goals.
- Coalition governments can provide more stable governance as parties are less likely to withdraw support and cause early elections.

5. Challenges of Coalition Government:
- Coalition governments can face challenges in decision-making and policy implementation due to diverse party interests and ideologies.
- Coordination between parties may be difficult, leading to delays or disagreements in policy implementation.
- Maintaining unity and managing conflicts within the coalition can also be a challenge.

In summary, a coalition government is formed by two or more parties coming together to govern. It is a means to ensure stability and effective governance when no single party can secure a majority.