What is Clientelism? Meaning, Definition, and Explanation

From Wikipedia: https://en.wikipedia.org/wiki/Clientelism

Clientelism or client politics is the exchange of goods and services for political support, often involving an implicit or explicit quid-pro-quo. Clientelism involves an asymmetric relationship between groups of political actors described as patrons, brokers, and clients. In client politics an organized minority or interest group benefits at the expense of the public. Client politics may have a strong interaction with the dynamics of identity politics. This is particularly common in a pluralist system, such as in the United States, where minorities can have considerable power shaping public policy. The opposite of client politics is 'entrepreneurial' politics, or conviction politics.

Although many definitions for clientelism have been proposed, according to the political scientist Allen Hicken, it is generally thought that there are four key elements of clientelistic relationships:

Dyadic relationships: Simply, these are two-way relationships.
Contingency: Delivery of a service to a citizen by a politician or broker is contingent on the citizen's actions on behalf of the politician or party through which they are receiving services.
Hierarchy: The politician or party is in a higher position of power than the citizen.
Iteration: The relationship is not a one-off exchange, but rather, ongoing.
Contingency and iteration are the two components shared across most definitions of clientelism.

Further reading:
Discourse on Voluntary Servitude, Etiénne de la Boétie - https://www.amazon.com/dp/B09DMR96XZ
Stokes, Susan C.; Dunning, Thad; Nazareno, Marcelo; Brusco, Valeria (September 2013). Brokers, Voters, and Clientelism: The Puzzle of Distributive Politics.