what are corporate marketing materials?

Would that include something like websites, commercials, or maybe just brochures, even seminars?

Could also include:

- announcement letters
- sales manuals
- pamphlets
- print ads
- billboards
- jingles
- signs in mass transit and elseqhere
- skywriters (or at least the text for these)
- loudspeaker cars (don't see many of these anymore)