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F-curves are curves that show the changes in value over time of animated properties. Use this tag for questions about creating and modifying F-curves.

The manual describes F-Curves thus:

After animating some property in Blender using keyframes you can edit their corresponding curves. When something is “animated”, it changes over time. This curve is shown as something called an F-curve. Basically what an F-curve does is an interpolation between two animated properties. In Blender, animating an object means changing one of its properties, such as the object’s location, or its scale.

Interpolation is a mathematical term for the process of calculating what animators call in-betweens, the value that an animation property takes as time moves from one keyframe to another.

F-curves are changed by changing keyframes, but they can also be manipulated in the Graph Editor.

Use this tag for questions about creating and modifying F-curves, especially in the Graph Editor.