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Digital watermarking is the efficient method to protect the digital information. Digital Watermarking is the method that embeds information known as a watermark into a multimedia object such watermark may be detected or extracted later to create an assertion regarding the object. Watermarking is either ”visible” or ”invisible”. Though visible and invisible are visual terms watermarking isn't restricted to images, it can even be wont to shield alternative sorts of multimedia object. This paper review many techniques regarding digital watermarking (visible and   invisible).

Visible watermarking
Invisible watermarking
Fragile watermarking
Semi fragile watermarking
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