what do symbols like "nn" and "kk" do in a MATLAB script?

For example, what does the following portion of a script mean/do?

for kk = 1:size(session,1)
            dara_folder{kk} = strcat("whatever name you want for that folder");
end

Answer 1

[Star Strider]

The ‘kk’ is simply the variable name for a loop counter in this code. (Any valid variable name will work.) See the documentation on for (link) loops for a full explanation.