A BOP is a package: general liability + commercial property + business interruption, priced together. For eligible small businesses it's almost always cheaper than buying the three pieces separately.
Who qualifies: most retail, service, professional office, restaurant, and small contractor operations under 100 employees and a few million in revenue. Higher-risk classes (heavy manufacturing, some construction) get pushed to monoline policies.
The property piece covers your building (if you own it) and business personal property — inventory, equipment, furniture, electronics. Check the coinsurance clause; underinsuring property triggers penalties on partial losses.
Business interruption is the underappreciated piece. If a fire closes your restaurant for 90 days, BI pays your lost net income plus continuing expenses — often the difference between reopening and closing permanently.
BOPs usually include token cyber and employment-practices coverage. Both are undersized for real claims. Add a dedicated cyber policy and EPLI if you have employees.