Brown recluse spiders have a characteristic dark brown violin marking on their back.
Some spiders do not build webs and are known as “hunters” that actually hunt, ambush or run down their prey. These spiders usually live outside in gardens, around the structure and foundations.
Some spiders, like orb weavers, make very distinctive large round/circular webs. Others make rather unorganized webs, or funnel-shaped webs. These spiders build these webs to capture their food source (mainly flying insects).