What is the difference among a packet filtering firewall a stateful firewall and a deep packet inspection firewall

Packet filtering firewall: A packet filtering firewall is the most basic type of firewall that filters incoming and outgoing packets based on predefined rules. It can examine the source and destination IP addresses, port numbers, and protocol types to determine whether to allow or block traffic.

Stateful firewall: A stateful firewall is an advanced version of packet filtering firewall that can keep track of the state of network connections. It can inspect the traffic and determine whether it belongs to an existing connection or a new connection. It can also remember which packets have been allowed or denied previously, allowing it to make more informed decisions about new traffic.

Deep packet inspection firewall: A deep packet inspection firewall is a more sophisticated type of firewall that can inspect the entire packet payload. It can look beyond the header information and analyze the content of the packet, including application-level protocols and data. This allows it to detect and block more sophisticated attacks that may be hidden within legitimate traffic. It can also identify and prioritize different types of traffic, such as VoIP or video streaming.