Smudge sticks are burned to smudging a home or space. All of the below smudges are used for protection and cleansing ceremonies throughout history:

California White Sage: Remove Negative energy/vibes/thoughts. Used in Native America traditions and rituals.
Cedar: Purify places, objects and people.
Lavender: Burning lavender attracts positive energy.
Yerba Santa: Attracts ancestors.
Vetiver Root: Grounding and centering energy.
Palo Santo: Promoting feelings of peace and tranquility.