Mascara comes in all sort of formulas for lengthening, thickening, coloring, etc.
There are also different types of mascara wands for curling, flexibility, definition, etc.
It seems like mascara should be broken down into two categories, waterproof and non-waterproof but it’s so much more than that!
I’m pretty confident that you beauties know the different between a waterproof mascara and one that is not, so I’m not going to get into that; but here are some things you may not know about other types of mascara:

Smudgeproof mascaras are usually harder and thicker because they are designed to withstand rubbing and they dry quicker. Most smudgeproof mascaras are also waterproof to withstand moisture (duh!)

Volumising mascara add thickness to your eyelashes. These types are thicker and darker than other mascaras. Because of the thick consistancy, volumising mascara is prone to flaking. Avoid this by applying 2-3 coats.

Lengthening mascara is perfect for thin, short lashes! Some have sythentic fibers that add length to your eyelashes, others just create the illusion of longer lashes.

Lash Defining mascara is the complete package: darkness, thickeness, length. It adds length, creates volume and makes your lashes look darker. Ideally, this is the mascara for you if you require all 3 uses.

Mascara formula is just as important as the mascara brush/wand because this is what actually defines the shape of your lashes.
Here are the different types of wands:

Curved brushes curl and lift the lashes. The proper application for a curved brush is to sweep the brush from root to tip, starting at your inner lashes.

Straight brushes are designed to cover each lash, evenly,  in one stroke. This brush type is best for beginners.

Lash Comb brushes are designed to separate your lashes and they do not normally add volume but are great for length. This brush is perfect for those with naturally thick eyelashes.  Apply by combing lashes from root to tip.

Rubber Bristle brushes layer individual lashes evenly, without clumping. Short, tightly spaced bristles add volume. Long, loosely spaced bristles add length and separate. Usually, rubber bristles attempt to combine short and long bristles, as well as tight and loose spacing, to coat even your tiniest lashes, which adds volume and coats lashes from root to tip to add length.

Flexible brushes are made to move freely and reach the root of the eyelashes deeper than any other wand.

When choosing a mascara brush, remember shorter bristles are better for thickening and longer bristles are better for lengthening.
If your lashes are thick & short, try a lengthening mascara. If your lashes are sparse, try a thickening mascara.
Head to your nears cosmetic counter to find a mascara that best suits you! But don’t forget to use a new wand each time you dip into the mascara tube.

I use volumising mascara and I prefer a flexible or curved brush.
What is your preference? Leave me a comment :)