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From Wikipedia
cURL is a command line tool for transferring files with URL syntax, supporting FTP, FTPS, HTTP, HTTPS, Gopher, Telnet, DICT, FILE and LDAP. cURL supports HTTPS certificates, HTTP POST, HTTP PUT, FTP uploading, Kerberos, HTTP form based upload, proxies, cookies, user+password authentication, file transfer resume, http proxy tunneling and many other features. cURL is open source/free software distributed under MIT License.
libcurl is the corresponding library/API that is intended to be incorporated into users' programs. You may think of cURL as a stand-alone executable made out of the libcurl library.
Basically, a program can use cURL to access a page and get the contents of it. It is used in a lot of php scripts.
It's a grabber because it "grabs" the content of you page for part of a program, it doesnt render the html for the user.
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