# Change Detection and Notification of Webpages: A Survey

## TL;DR

This survey reviews various change detection and notification systems for webpages, analyzing their techniques, challenges, and areas for improvement to help users stay informed about dynamic webpage updates.

## Contribution

It provides a comprehensive classification and analysis of existing CDN systems and techniques, highlighting current challenges and future research directions.

## Key findings

- Various techniques used for webpage change detection
- Identification of key challenges in CDN systems
- Areas for future improvement in change notification methods

## Abstract

Majority of the currently available webpages are dynamic in nature and are changing frequently. New content gets added to webpages and existing content gets updated or deleted. Hence, people find it useful to be alert for changes in webpages which contain information valuable to them. In the current context, keeping track of these webpages and getting alerts about different changes have become significantly challenging. Change Detection and Notification (CDN) systems were introduced to automate this monitoring process and notify users when changes occur in webpages. This survey classifies and analyzes different aspects of CDN systems and different techniques used for each aspect. Furthermore, the survey highlights the current challenges and areas of improvement present within the field of research.