What is the Difference Between Crawler & Spider?

There are same work of crawler & spider "indexing". But we can say in google term different-different.

Spiders is a name for the robots or crawlers that scan site and save the information in websites to a database. Crawler – a program that automatically follows all of the links on each web page.

Crawler – The program is automatically to follow the links are web page.
Spider - The browsers are like a program and to download the web page.

There is no difference between crawler and spider. Both are same term used for web crawling.

Crawler- a program that systematically browses the World Wide Web in order to create an index of data.

Spider- another term for crawl

Architecture of a Web crawler
A Web crawler, sometimes called a spider, is an Internet bot that systematically browses the World Wide Web, typically for the purpose of Web indexing (web spidering)

The question is not understandable

Spiders is a name for the robots or crawlers that scan web and save the information in websites to a database.

Crawler- a program that systematically browses the World Wide Web in order to create an index of data.
Spider - a browser like program that downloads web pages.

There are not much differences between them. But in technically Spiders is a name for the robots or crawlers that scan web and save the information in websites to a database.

Spider - The browsers are like a program and to download the web page.

Crawler – The program is automatically to follow the links are web page..

Spider Scan and judge you website content ,Crawler crawl you content and index it in there searches according to Inbound links both techniques helps google to judge importance of website in terms of ranking ,robot.txt file is that file which is included into web coding so that google not consider it in crawling or to hide page from google crawling .

crawler is a program that visits Web sites and reads their pages and other information other hand in spider The browsers are like a program and to download the web page.

Crawler- a program that systematically browses the World Wide Web in order to create an index of data.
Spider - a browser like program that downloads web pages.

Spiders is a name for the robots or crawlers that scan web and save the information in websites to a database. Hence, "Google spiders" is another name for "Google indexing bots". Spider - a browser like program that downloads web pages. Crawler – a program that automatically follows all of the links on each web page.

Spider and crawler are technically the same, except that spider is used mainly for a tool used to crawl the website, while crawler is used for search engines

crawler is a program that visits Web sites and reads their pages and other information other hand in spider The browsers are like a program and to download the web page.

Crawler- a program that systematically browses the World Wide Web in order to create an index of data.

Spider- another term for crawl

Spider - a browser like program that downloads web pages.
Crawler – a program that automatically follows all of the links on each web page.