The current study presents a novel examination of heat transfer properties in a magnetohydrodynamic (MHD) flow of Casson fluid across a porous stretching sheet. uniquely incorporating the effects of heat source and variable viscosity. Unlike previous studies. this research employs the Lie similarity transformation to convert the governing equations into a dimensionless form. https://parisnaturalfoodes.shop/product-category/reg-tampons-w-app/