There are many difference between spiders and insects; for example, insects have six legs while spiders have eight, insects eat various foods while spiders primarily eat insects, insects have antennae while spiders do not and insects often have wings and spiders never have wings. Insects also have three distinct body sections while the spider only has two.
Insects are able to smell by using their antennae while the spiders are able to smell by using their leg bristles. The three distinct sections of the insect are the abdomen, thorax and head while the two distinct sections of the spider are the abdomen and the cephalothorax. Both insects and spiders are members of the phylum Arthropoda.