The download or download speed is the time it takes for the information from the Internet to reach our device and the upload or upload speed is the opposite, the time it takes to send the information from our device to the Internet.
The ping is a unit of measurement that is expressed in milliseconds and measures the latency, that is, the speed with which a data packet is transmitted in the network. The lower the ping, the better our latency.
Jitter measures the stability of the connection. The smaller the jitter, the more stable the connection.