> For the complete documentation index, see [llms.txt](https://riteshs4hu.gitbook.io/infosec-notes/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://riteshs4hu.gitbook.io/infosec-notes/reconnaissance.md).

# Reconnaissance

Reconnaissance, also known as Footprinting or Information Gathering, is the process of collecting information about a target system, network, application, or server. The methodology used in reconnaissance depends on the nature of the target, whether it is an internal server, external server, or web application.

### There are two types of Reconnaissance:

* [**Passive Reconnaissance**](/infosec-notes/reconnaissance/passive-reconnaissance-techniques.md)**:** Collecting information without directly interacting with the target system (e.g., searching public databases, social media, or search engines).
* [**Active Reconnaissance**](/infosec-notes/reconnaissance/active-reconnaissance-approach.md)**:** Directly probing a system or network to identify vulnerabilities, open ports, or services (e.g., using tools like Nmap or Nessus).