What is "1 action - 0s)

In my Piwik Visitor log, i found many log that is “1 action - 0s”. So what is this? And did this visitor visit my web?

Thanks and sorry for my English!

0s seems to indicate the visitor left the page without doing any other action on your website.

Did you check your bouncing stats ?

I see. Thank you very much. As it would seem that any visit that only have 1 action is considered 0s

1 action - 0s would indicate a visitor who spent no time on your site. 0 seconds. This has to be a bot correct? I’m having this same issue.