Lots, but not all, bread is kosher. Some breads contain non-kosher ingredients or are processed on the same equipment as non-kosher products, so it is imperative to purchase bread that is certified kosher.

In addition, it is preferable to use pat Yisrael products whenever possible. This means that a Jewish person has baked (or assisted in the baking of) the products. Even if he or she simply lights the oven, it is considered as having assisted.

Homemade bread made by a non-Jew with no Jewish involvement is forbidden by halachah, even if it contains only kosher ingredients and perfectly kosher equipment was used.

Read more about the ins and outs of kosher bread.