What are the main differences between EF-M and EF-S lenses in terms of compatibility and performance?

EF-M lenses are designed for Canon mirrorless cameras, while EF-S lenses are designed for Canon DSLR cameras. EF-M lenses are not compatible with DSLR cameras, and vice versa. In terms of performance, EF-M lenses are typically smaller and lighter than EF-S lenses, but may have limitations in terms of focal length and aperture range. EF-S lenses are generally more versatile and offer a wider range of options for photographers.