Add the following code snippet to your theme’s functions.php file if you want to display production descriptions in categories for WooCommerce.

// WooCommerce: Display product descriptions in categories
add_action( 'woocommerce_after_shop_loop_item_title', 'output_product_excerpt', 35 );
function output_product_excerpt() {
global $post;
echo $post->post_excerpt;
}