Can I use Google logo for free?

Could you elaborate on the legality and ethical considerations of using the Google logo for free? I'm interested in understanding whether it's permissible to incorporate the logo into my website or promotional materials without seeking explicit permission or paying a fee. I've noticed that many brands utilize logos from major companies in their marketing, but I'm unsure if Google falls into this category. Is there a clear-cut answer to this question, or does it depend on the specific context and intended use? I'd appreciate your insights on this matter.