There are different things that an internet packet data consists of. It contains the following: the source, the destination address, message bytes, some bits to double check the path that it would go to, path identification bits, and the serial number of packets. If there is some information that is missing, it will not work. Everything that you have to do online is dependent on these packets.
There will even be data available for the time when the connection to a certain website has ended. The packet data is in charge of allowing people to browse through the different areas of the web. They will allow people to check different networks as well.