The lower this number, the faster your connection is. This indicates the latency or the time it takes your PC to connect to a remote server.
On the main screen, you can also see the name of the internet provider and the ping of your connection.
You just have to open the tool and press the start button to get trustworthy data about the quality of the service you have contracted - in terms of both upload and download speed. Speedtest by Ookla is a simple Windows program that lets you easily analyze the speed of your Internet connection.