Revenue Divisions are administrative units that represent subdivisions of Districts in Tamil Nadu. Here is an explanation of this answer:

Definition of Revenue Divisions:
- Revenue Divisions are administrative units that are created within a district to facilitate better governance and administration.
- They serve as sub-district level administrative units and are responsible for the implementation of various government policies and programs at the grass-root level.

Role and Responsibilities of Revenue Divisions:
- Revenue Divisions act as intermediaries between the district administration and the taluks or tehsils within the district.
- They play a crucial role in the implementation of various government schemes, collection of revenue, and maintenance of law and order at the sub-district level.
- Revenue Divisions are headed by Revenue Divisional Officers (RDO) who are responsible for the overall administration of the division.

Significance of Revenue Divisions in Tamil Nadu:
- Tamil Nadu is divided into several Revenue Divisions, which are further divided into taluks or tehsils.
- Revenue Divisions in Tamil Nadu act as administrative units that coordinate and monitor the implementation of government programs and policies at the sub-district level.
- They play a vital role in the collection of revenue, land administration, and maintenance of law and order in their respective divisions.
- Revenue Divisions in Tamil Nadu also serve as a convenient administrative unit for the effective delivery of public services to the people living in rural and semi-urban areas.

Conclusion:
In conclusion, Revenue Divisions represent subdivisions of Districts in Tamil Nadu. They play a crucial role in the administration and governance of the state by coordinating the implementation of government schemes, collection of revenue, and maintenance of law and order at the sub-district level.