A network packet is a small group of data sent over a computer network. When a user requests a file, a server sends the file as individual packets that are reassembled into the file at the destination.
Each packet includes a header and payload. The header contains information about the packet, such as the source address and destination address. The payload contains the data sent to the user.
Packets make transferring data quick and reliable. If a packet doesn't arrive at the destination, the server only needs to resend the packets that didn't arrive, not the whole file.
Latency is the time between when a user makes a request to when the website or application responds to the request.
Software as a service (SaaS) is a way of delivering and licensing software over the Internet, typically through a recurring subscription.