DNS caching is a temporary storage of previous DNS lookups on your computer or network device. When you visit a website, your system needs to translate the domain name (like example.com) into an IP address (like 192.0.2.1). Instead of performing this lookup every single time, the result is stored locally for a period of time.

This process significantly speeds up your browsing experience by reducing the time needed to resolve domain names. Here's how DNS caching typically works:

• Local Cache: Your operating system stores recent DNS lookups.
• Browser Cache: Web browsers like Chrome or Firefox maintain their own DNS cache.
• Resolver Cache: Your ISP's DNS servers cache responses for many users.

The Time-To-Live (TTL) value determines how long a DNS record remains in cache. Administrators set TTL values to balance between performance and accuracy of information.

Common issues related to DNS caching include seeing outdated website content or being unable to access a recently moved site. To resolve these, you can:

• Clear your browser's DNS cache
• Flush your operating system's DNS cache
• Wait for the TTL to expire naturally

Understanding DNS caching helps you troubleshoot website access problems and appreciate the efficiency mechanisms working behind the scenes of your internet experience.