Whats is DB Connections(Count) in AWS?

What is meaning of DB Connections(Count) report on AWS RDS? I have gone through their documentation but didn't find my answer there.

I am quite confused with DB Connection report on my AWS. I can see their only 1 connection available but I am sure that there are always 100-150 concurrent users on my website on different pages which users database operation.

As the user concurrency is 100-150 then why it shows me only 1 connection on report.

Note : My website is working well on good performance.