Step 1: Meaning of coalition government:
A coalition government is formed when no single political party wins a clear majority in the legislature, so two or more parties join together, pooling their seats to form a government and share power and responsibility.
Step 2: Indian context:
Coalition governments became common in India from 1989 onward as the Congress party's dominance declined and the party system fragmented into multiple regional and national parties.
Step 3: Background to 1980:
The Janata Party government (1977-79), itself a loose coalition of parties opposed to Indira Gandhi's Emergency, was riddled with internal ideological differences and factionalism from the outset.
Step 4: Reasons for the 1980 mid-term poll:
The Janata coalition collapsed due to leadership clashes (notably between Morarji Desai and Charan Singh) and disputes over the 'dual membership' issue (RSS-affiliated members within the Janata Party); Charan Singh's short-lived government also lost majority support quickly, leaving no stable alternative and forcing the President to call fresh elections in January 1980.
Step 5: Outcome:
These elections resulted in Indira Gandhi and the Congress returning to power with a decisive majority.