Query regarding namespace

What does using namespace std actually mean?

hello @Senjuti256
pls refer this -> hit me

the link is not opening.

https://medium.com/breaktheloop/why-using-namespace-std-is-used-after-including-iostream-dc5ae45db652#:~:text=“using%20namespace%20std”%20means%20we,%3A%3Acout%2C%20std%3A%3Aendl.

@Senjuti256 is your doubt cleared? if yes dont forget to mark it resolved