Error 206

hello, I am not an expert when it comes to server issues, I usually work with frontend stuff but there´s a project in which I´m helping a friend and we´re getting error 206 in a high rate (73%).
In a search I did I could realize it´s not exactly an error, it just means that partial content was delivered, but I still could not understand what that means in ‘practical’ world…
Does that mean visitors are giving up after they request files/pages? Is that it? Does anyone know?