Smudge sticks is a bundle of dried herbs, most commonly white sage and has been known to be combined with other dried botanicals such as dried rose petals. Smudge sticks have been used for a multitude of things, but it is most common for safeguards against negativity that could interfere with sleeping as well as purifying a new apartment before moving in.
 
You may have also heard people say they burn Sage to provide self-protection and remove negative energy from around them. 
 
These are just some ways that Sage have been utilized and there are several other reasons.
 
Simple steps on how to burn Sage
The Sage bundle will need to be lite with a match or lighter
Allow the leave tips to smolder slowly, allowing the thick smoke to fill the desired area
The smoke should circulate throughout the desired area but be mindful of the individual or area that you would like to focus on
Make sure you collect the ashes in the proper utensils that are fire safe such as an ash tray, shell or ceramic bowl or ceramic cup 
 
NOTE: Please do not leave burning Sage unattended or around children