# What is the difference between inclination and obliquity?

I'm trying to understand the differences between obliquity and inclination when it comes to a system of a planet orbiting a star. From what I understand, obliquity is the angle between the orbital plane of the planet and its axis of rotation. However, when I am reading about inclination - it seems that it is very similar. Can someone please clarify the difference between the two?

I emphasise the word "chosen" because the choice of reference plane is in some sense arbitrary. It is like choosing a frame of reference to locate the orbit of the planet. Strictly one should always say that the inclination is $$i$$ degrees relative to the plane of the ecliptic (or the equator etc), but typically the reference frame is understood from the context.