are categorized by their content type (Table, Image, No Image) and
by the way they are created (user, layer-based, auto).
created with the Slice tool are called user slices;
slices created from a layer are called layer-based slices.
When you create a new user slice or layer-based slice, additional auto
slices are generated to account for the remaining areas of
the image. In other words, auto slices fill the space in the image
that is not defined by user slices or layer-based slices. Auto slices
are regenerated every time you add or edit user slices or layer‑based
slices. You can convert auto slices to user slices.
User slices, layer-based slices, and auto slices look different—user
slices and layer-based slices are defined by a solid line, whereas
auto slices are defined by a dotted line. In addition, user slices
and layer-based slices display a distinct icon. You can choose to
show or hide auto slices, which can make your work with user-slices
and layer-based slices easier to view.
A subslice is
a type of auto slice that is generated when you create overlapping slices.
Subslices indicate how the image is divided when you save the optimized file.
Although subslices are numbered and display a slice symbol, you
cannot select or edit them separately from the underlying slice.
Subslices are regenerated every time you arrange the stacking order
Slices are created using different methods: