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All packets are saved in .pcap files on your device so they can be used for further analysis.

A packet analyzer (also known as a network analyzer protocol analyzer or packet sniffer—or for particular types of networks an Ethernet sniffer or wireless sniffer) is a computer program or piece of computer hardware that can intercept and log traffic that passes over a digital network or part of a network. As data streams flow across the network the sniffer captures each packet and if needed decodes the packet's raw data showing the values of various fields in the packet and analyzes its content according to the appropriate RFC or other specifications.

Packet capture is the process of intercepting and logging traffic.

Reference:
https://en.wikipedia.org/wiki/Packet_analyzer