Is internet data broken up as variable length packets?

Yes, internet data is broken up into variable-length packets, but it often uses fixed-length segments at the transport layer, such as TCP, which typically segments data into fixed-size packets of around 1,500 bytes (maximum transmission unit). However, the actual payload size within those packets can vary based on the data being transmitted. This approach allows for efficient use of the network and accommodates varying types of content and network conditions.