A firewall handles all traditional firewall functions (SPI, ACLs, etc.) as well as additional security functions such as antivirus filtering, spam filtering, application proxy filtering, and so forth.

UTM consists of a firewall handling all traditional firewall functions (SPI, ACLs, etc.) as well as additional security functions such as antivirus filtering, spam filtering, application proxy filtering.

Explanation:

The term UTM stands for Unified Threat Management

A traditional firewall is defined as a device that can control the flow of traffic that is allowed to enter or exit a point within the network.

The  technique  of traffic monitoring means that the firewall just keep a check over each  data packet  individually without disturbing  the “flow” of traffic

Few Example of the fire wall used by  small business houses are  -Fortinet, Ubiquiti EdgeRouter, Cisco NGFW, OPNSense.

it on google i find it on there

a study funded by private corporations refuting global warming