Information travels through a computer network in small units of data called packets. All of our day to day activities online, from emailing to streaming, involves sending packets of data through the network. When one or more of these packets of data fails to reach its final destination, this is called packet loss.
Packet loss can occur due to bandwidth congestion, an outdated router, faulty cable, a weak Wi-Fi signal, or software issues. Packet loss should be less than 1%, and anything over 5% will impact the quality of streaming audio and/or video.