Eau de toilette and eau de parfum
Eau de toilette generally indicates a lighter concentration than eau de parfum, although the terms are not a reliable prediction of strength or longevity across different houses. Versions with the same name may also have different compositions. One can emphasise a bright opening while another gives more space to woods, florals or the base. Choose the version whose development you enjoy, rather than treating the labels as a simple ranking of quality.
Explore Eau de Parfum.