@vickym said:
using api on wordpress
I have an exisiting entertainment website built on wordpress.
Can I use the tmdb api on that site

Yes.

and if yes, then how can i integrate it.

The information regarding the use of the TMDb API you will find in this link:
https://developers.themoviedb.org/3/getting-started/introduction
As for integration with your site, we cannot help.
I suggest seeing this link:
https://www.themoviedb.org/documentation/api/wrappers-libraries
and seek help from code programmers who use the same programming language you are using.

Thank You for guiding me.