Concept:
Cultures interact with each other and exchange ideas, customs, technologies, and traditions.
Step 1:
Cultural traits include language, food habits, customs, beliefs, dress, and technology.
Step 2:
Cultural diffusion refers to the spread of cultural elements from one society or group to another.
Step 3:
The spread of fast food culture, yoga, music, and fashion across countries are examples of cultural diffusion.
Step 4:
The terms cultural refusion, defraction, and refraction are not accepted sociological concepts related to cultural spread.
Step 5:
Therefore, the correct answer is Cultural Diffusion.
\[
\boxed{\text{(1) Cultural Diffusion}}
\]