The Domain Name System (DNS) is a hierarchical, decentralized naming system that associates domain names with IP addresses. In simpler terms, it acts as a translator between the human-readable domain names we use to access websites and the numerical IP addresses that computers use to identify each other on the internet. By providing a way to easily remember and navigate to websites, DNS plays a crucial role in making the internet user-friendly.
The Domain Name System (DNS) cache is an essential component of the internet infrastructure that plays a crucial role in translating domain names into IP addresses. When a user enters a website's domain name into their browser, the DNS cache retrieves the corresponding IP address associated with that domain name.
DNS caching works by storing previously resolved domain name and IP address pairs in a local cache on the user's device or within the network infrastructure. This cache allows faster and more efficient retrieval of IP addresses, eliminating the need to query the DNS server every time a user visits a website.
When a user accesses a website for the first time, the DNS resolver sends a query to the DNS server to obtain the IP address associated with the domain name. The DNS server responds with the IP address, and the resolver stores this information in its cache for future use. Subsequent requests for the same domain name can then be resolved directly from the cache, eliminating the need for additional DNS queries.
Responsive web design refers to the approach of designing and developing websites that can adapt and adjust their layout, content, and functionality to provide an optimal viewing experience across a wide range of devices and screen sizes. It involves crafting a single website that responds dynamically to the user's device, whether a desktop computer, laptop, tablet, or smartphone. This adaptability is achieved through the use of flexible grids, fluid images, and media queries that allow the website to resize and rearrange its elements seamlessly.
