Why is it important to wear a lab coat during an experiment?

Lab coats several purposes. Aside from the psychological boost of making you look like you know what you are doing in a lab, they:

Provide another layer of protection from splashes spills and flames - being burned or poisoned is not much fun.

Can be taken off quickly if you do get something poisonous or nasty on you.

Have pockets for equipment bits, pens and paper.

Can be left in the lab at the end of the day so you don't carry poisonous things home on you normal clothes.

Are generally white so you can see where or if splashed material is on you.

Protect your clothes from damage. and if he coat gets damaged or contaminated they aare cheap enough to throw away. As in microbiology lab we encounter with different microbes and to reduce the chance of any microbial attack on us we should wear lab. coat and it is also for the culture wr are preparing so that it can also be saved a bit from contamination.