Description:
Triton X-100 is a commonly used detergent in laboratories^[1]. For example:

• Permeabilize unfixed (or lightly fixed) eukaryotic cell membranes.
• Used in conjunction with zwitterionic detergents such as CHAPS to solubilize membrane proteins in their native state.
• Used in DNA extraction as part of the lysis buffer (usually in a 5% solution in alkaline lysis buffer).
• Reduce surface tension of aqueous solutions during immunostaining (usually in concentration of 0.1-0.5% in TBS or PBS Buffer).
• Emerging use in dispersion of carbon materials for soft composite materials
• Used in microbiology to restrict colony expansion in Aspergillus nidulans.

References:

1. Triton X-100 Product detail page from Sigma-Aldrich
2. Highlights Of Prescribing Information (also known as the Package Insert, or Product Monograph), FLUARIX brand Trivalent Inactivated Influenza Vaccine (GSK, Glaxo Smith Kline) Formulation 2010/2011
3. Highlights Of Prescribing Information (also known as the Package Insert, or Product Monograph), FLUZONE brand Trivalent Inactivated Influenza Vaccine (Sanofi-Pasteur) Formulation September, 2009 "Triton X-100". exactantigen.com. Retrieved 2009-10-22.