How does a search engine work?
List the four main parts of an e-mail header.
1. Go to http://www.google.com
2. Type in how does a search engine work (or whatever search terms you need). Press Enter.
3. Read different search results until you find what you need.
4. Re-search with different search terms if you don't find all you need.
To understand how a search engine works, let's break it down into three main steps:
1. Crawling: The search engine sends out automated programs called "spiders" or "crawlers" to explore the web and discover web pages. These spiders follow links from one page to another, creating a vast index of web pages that they find along the way.
2. Indexing: After the crawlers gather information from web pages, the search engine organizes and stores the collected data in its index. This index contains a copy of each web page the search engine has crawled and various details about them, such as keywords, links, and page structure.
3. Ranking: When you enter a search query, the search engine scans its index to find relevant web pages. It analyzes multiple factors, including keyword relevance, page quality, and user experience, to determine the most suitable results for your query. These results are then displayed in the search engine's ranking order, typically based on their perceived relevance and quality.
Now, let's move on to the second question about the four main parts of an email header. An email header contains vital information about the email's origin, destination, and transmission. The four main parts of an email header are:
1. From: This field indicates the email address of the sender, displaying their name (if provided) and the email domain.
2. To: This field shows the email address of the recipient(s) of the email. It can include multiple addresses if the email was sent to multiple recipients.
3. Subject: The subject field allows the sender to provide a brief description or summary of the email's content, helping the recipient understand its purpose or topic.
4. Date and Time: This part of the header displays the date and time when the email was sent from the sender's perspective. It helps in keeping track of the chronological order of emails.
Additional information may exist in the email header, such as CC (Carbon Copy) and BCC (Blind Carbon Copy) fields, along with technical information related to the email's routing and delivery path.
I hope this helps! Let me know if you have any further questions.