Unsaturated fats have as a part of their structure. these bonds are generally in the in naturally occurring fats

Unsaturated fats have at least one double bond as a part of their structure. These bonds are generally in the cis-conformation in naturally occurring fats.

In the cis conformation, H atoms are on the same side of the double bond, whereas in the trans conformation, they are on opposite sides of the double bond.