Highspeed and broadband are marketing terms, not scientific ones. “Broadband” usually refers to any Internet connection that is equal to or greater than 256Kb/sec. (This is 5X a dial-up modem.)

Unless you go with a Comcast dial-up plan, which I don’t know if they even offer anymore, all their plans will be equal to or greater than 256K, and can run up to more than 12Mb/sec.

Short answer, yes, all Comcast Internet plans are highspeed/broadband.

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cut and paste this to your browser it will tell you what is available!