Look at this beautiful loaf of homemade bread. Doesn't it look delicious? It is Walnut Bread. It must have come out of the oven very recently, because it is setting on a cooling rack.
This bread has been made by hand instead of in a bread machine. If it had been made by machine, it would have baked right in the machine. Since it has a more natural surface, we can see that it was made by hand and baked in an oven.
If you want to refer to one of these, it is a loaf of bread. Since the word bread is uncountable, it cannot be called a bread. If you want to refer to more than one, you can say loaves of bread. There might be two loaves of bread, five loaves of bread, or just some bread.
Once you have sliced the bread, you will have slices of bread. In some restaurants, mini loaves of bread are served before the meal. These are often split in half rather than sliced because of their small size. If they are very small, they are called rolls instead of loaves of bread.
Some realtors tell sellers to bake some bread just before potential buyers come to look at a house. They say that the fragrance of baked bread gives the buyers a warm feeling and makes them see the house in a more positive light.