To start with, hair spray is a product you spray into your hair to keep it in place while protecting your hair from humidity and wind. It is designed to cause individual hairs to stick together so they don't move. Although hair sprays are usually found in spray form, it can also be found in pump form.
In general hair spray can be either a light hold or flexible formula which allows you to play with your hair style while still being able to brush it out or it can be a strong hold formulas which hold your hair in place and is great to use on those stray hairs when you wear a pony tail. Hint: to get rid of those stray hairs, you just need to spray the hairspray on a toothbrush and run the tooth brush through the pieces of hair you want to stay put.
Unfortunately, hair spray is not just hair spray in that it can be found in so many different types. You can have a regular hair spray that holds your hair in place without doing anything else or having additional ingredients. Then there is the working hair spray designed to allow the maximum amount of movement with the least amount of hold. This type of spray takes longe to dry, builds up when used again and again without washing, but you can tease or texturize the hair after being used.
The third possibility is the volumizing or thickening spray. It has the same properties as a regular hair spray but it makes your hair look fuller and thicker. On the other hand, you might consider a shaping hairspray which is slow drying so you can finish styling the hair and it will hold it in place when you are done. Although the shaping spray and the working spray is that the working spray is mostly used while stying the hair and the shaping spray is used to keep the styled hair in place. The shaping spray is more of a finishing spray.
Then there is the texturizing hair spray. This one is similar to a dry shampoo but it can be used on all the hair rather than just the roots. It doesn't leave any white residue nor does it absorb oil from the scalp. In addition, it can cause the hair to have more volume by separating the individual hairs and provides holding power.
Now, if you use a lot of heat based tools, look at using a thermal hair spray. A thermal hair spray adds extra moisture to the hair while preventing the natural moisture from escaping. and it protects the hair by creating a barrier. Once you've finished using the heat, the spray will continue holding the hair in the desired style. If you are going to use heat on your hair, use the thermal hair spray rather than regular hair spray because the regular hairspray contains alcohol and can damage your hair.
If you have super fine hair, look at using a weightless hair spray. It is quite light so it won't weight down your hair and it will look great. On the other hand, if you want something to hold your hair in place so it won't budge no matter what, look at using a freeze hair spray. It is one of the sprays designed to hold hair solidly in place. If you want to add shine to your hair, consider using a shine hair spray to finish off your hair and give you the shiny look you want.
Finally, when your hair is styled, finish the look off with some finishing spray. This one is a heavy spray designed to keep your hair in place for the rest of the day. Some can add shine while other provide a matte finish. So if you decide to use hair spray, get the spray that will work best in your situation. Let me know what you think, I'd love to hear. Have a great day.