Put simply, cookies are a small set of data from a website which are sent to your search device including a Laptop, phone or tablet, which are then stored in a file on your web browser such as Google Chrome, Apple Safari or Firefox etc. The minimal information stored in this file includes the name of the website and a unique identity number for you as the website user. Other information may include how long you spent on that website, which search preferences you make, which items remain in your cart or which links/pages you clicked on. Then, each time you return to that website, the website recognises that you are a returning user and companies can target your needs and wants because they have a small amount of information about you. They will often customize your experience by tailoring their website to your preferences.
The simple answer is yes you can.
Cookie files can have a large impact on your future web experience as an online user. It is always a great idea to do your own research before you accept or decline anything on the internet.