Reform refers to the improvement or amendment of what is wrong, corrupt, unsatisfactory, etc. The modern usage of the word emerged in the late 18th century and is believed to have originated from Christopher Wyvill's Association movement, which identified "Parliamentary Reform" as its primary aim. Reform is generally regarded as antithetical to revolution.
Developing countries may implement a range of reforms to improve living standards, often with support from international financial institutions and aid agencies. This can involve reforms to macroeconomic policy, the civil service, and public financial management.
In politics, there is debate over what constitutes reform vs. revolution, and whether all changes labeled "reform" actually represent progress. For example, in the U.S., proponents of term limits or rotation in office consider it a revolutionary means (dating back to the Articles of Confederation) of rooting out government corruption by altering basic political connections between incumbents and constituents. Opponents say that congressional term limits could create perverse incentives, and hinder reform, by taking power away from voters and encouraging "revolving door" politics.
A government's ability to implement reforms, referred to as its state capacity, is constrained by the prevailing political system.