There are many different types, And I am pretty sure if you google, you will find a lot of information. An Easel is a stand for your artwork. ⠀
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Let's speak about H-Frame Easel(or studio Easel):⠀

Same type as you see in the picture.⠀

Features:⠀

- Heavy (don't use for Plein air)⠀

- Stable (have a strong base)⠀

- Expensive (ranges from $90 - $1460)⠀

- Some of the models might be collapsed for storage ⠀

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H-Frame easels are ideal for artists who need stable easels and the ability to work on large canvases.⠀

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Best; I have this type of easel in my small studio. Useful for various sizes of canvas.⠀

I will speak to you soon⠀