What do you mean by duplicate content?

[thaichacha]

What do you mean by duplicate content?

[MVMinfotech18]

Duplicate content generally refers to substantive blocks of content within or across domains that either completely match other content or are appreciably similar.

[RH-Calvin]

Duplicate contents can be checked using various online tools like Copyscape. These contents are harmful for your website and should be removed immediately to avoid search engine penalties.