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DNS Server, how does google search your webpage, what are cookies, HTTPS, what are name servers, how does server mirroring work.

DNS (Domain Name System)

Think of DNS as the internet’s phonebook.
It translates domain names (like google.com) into IP addresses (like 142.250.195.78) which computers use to identify each other.
When you type a website into your browser, the DNS helps locate the server where the website is hosted.

2. How Does Google Search Your Webpage?

Google uses a process called web crawling and indexing:
- Crawling: Google bots (also called spiders) scan websites by following links.
- Indexing: Google stores copies of the crawled pages in its massive index.
- Ranking: When you search, Google uses algorithms to find and rank the most relevant pages from its index.

3. What Are Cookies?

Cookies are small data files stored by websites in your browser.
They store information like:
- Login status
- Shopping cart items
- Preferences (like language)
There are two main types:
- Session cookies: Deleted when you close the browser.
- Persistent cookies: Stay until they expire or are deleted manually.

4. HTTPS (HyperText Transfer Protocol Secure)

HTTPS is the secure version of HTTP.
It encrypts the data exchanged between your browser and a website using SSL/TLS.
Ensures:
- Data privacy
- Security
- Authentication of websites
You see a lock symbol 🔒 in the address bar when HTTPS is active.

5. What Are Name Servers?

Name servers are part of the DNS system.
They store DNS records for domains.
When someone types your domain into a browser:

The name server tells the browser which IP address to connect to.
Example: ns1.example.com and ns2
How Does Server Mirroring Work?

- Server mirroring is a backup method where one server is an exact copy (mirror) of another.
- Used for:
  - Load balancing (handling traffic from many users)
  - Redundancy (in case one server goes down)
- Helps improve:
  - Website uptime
  - Speed of access by serving users from the nearest serv

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