While a Summary Revision focuses on new eligibles and routine corrections, SIR goes far deeper, involving statewide house-to-house verification, detailed scrutiny of entries, and large-scale data audits. For instance, under a Summary Revision, a voter who has shifted homes must file a form to up...
Source: [Times of India](https://timesofindia.indiatimes.com/india/ec-announces-special-summary-revision-of-voters-list-in-17-states-amid-sir-row/articleshow/134969117.cms)