The illusion of seeing the phenomenal, ephemeral world as real.
The attachment to Maya is Moha.
Read about maya here
https://tulsidas-ram-books.weebly.com/uploads/2/1/7/4/21746472/maya-the_whirlpool_of_delusions_in_creation.pdf
Read a story here
http://www.sushmajee.com/biographies/bio-N-O/naarad-3-krishn.htm