Cultural diffusion is the spread of cultural beliefs and social activities from one group of people to another. Through cultural diffusion, horizons are broadened and people become more culturally rich.
For example, a woman living in Manhattan might purchase mala prayer beads used by Buddhist monks to focus on a breath or mantra. Her use of those beads, incepted halfway around the world, is now positively impacting her daily practice of meditation. Had she only ever walked the streets of Manhattan, never engaging with any product or activity outside her borders, life would be very different. Also, if it weren't for cultural diffusion, that same woman wouldn't be able to enjoy sushi night every Thursday evening with her friends!
The mixing of world cultures through different ethnicities, religions, and nationalities has only increased with advanced communication, transportation, and technology. Folks living in Australia can communicate daily via Twitter, Facebook, or Instagram with someone living in Russia. This enrichment allows us to open minds, and learn as much as we can from every corner of the earth.