Astroturfing is the practice of masking the 
sponsors of a message or organization (
e.g., political, advertising, religious or 
public relations) to make it appear as though it originates from and is supported by 
grassroots participant(s). It is a practice intended to give the statements or organizations more credibility by withholding information about the source's financial connection. The term 
astroturfing is a derivation of 
AstroTurf, a brand of synthetic carpeting designed to look like natural grass, a play on the word "grassroots." The implication behind the use of the term is that there are no "true" or "natural" grassroots, but rather "fake" or "artificial" support, though some astroturfing operatives defend the practice (see 
Justification below).
On the Internet, astroturfers use software to mask their identity. Sometimes one individual operates over many personas to give the impression of widespread support for their client's agenda.
[1][2] Some studies suggest astroturfing can alter public viewpoints and create enough doubt to inhibit action.