Difference between client dependent and client independent tables?

when we add a field MANDT of type MANDT then our table is client dependent and is visible to only that client. But if this Field is not added to the table then we can access the table using any client number.

or

tables which can be access by all user are client independent (no mandt field in table)
tables which can be access by some specific user are client dependent (use mandt field in table)

or

client dependent tables have a mandatory field MANDT field.

or

client-dependent table has the field MANDT of data type CLNT, which indicates Client id.

A client-independent table does not have this field.