what is smallmoney data type unit in sql server?

smallmoney data type in sql server makes me confuse.

after creating a table and add a columns with this data type, i entered a number(one) and it shows me this:
    
     1.0000

what is this means?this means is one dollar or one cent?
if i want to store one cent i should enter what?

     this 0.1 or 1.0000 and if is correct what about entering one dollar?

i want to store some things like this one dollar and 55 cent.

---

Thanks Motevallizadeh