# Difference between 10x10 fold and 10 fold cross validation

I'am working on a 4 class Brain computer interface and i want to validate my work , in so many academic papers they write 10x10 fold cross validation

What i want to know what is the 10x10 fold cross validation And is it different from 10 fold cross validation

Cross-validation can be done once (10 times, or simply 10), or done ten times (10 times done 10 times, or 10 x 10). For clarity, let's change these values to 5 and 5 x 20. Here's how this works:
Steps 1-3 constitute cross validation, which is the 10 you're asking about, or the 5 in the example. Step 4, which repeats steps 1-3, is repeated portion of repeated cross-validation and the x 10 you're asking about, or the x 20 in the example.