Insects, beetles, and terrestrial arthropods are all categories of creatures that are differentiated based on their specific characteristics. Here's a brief overview of what each term means:

1. **Insects**: Insects are a class within the phylum Arthropoda. They have a chitinous exoskeleton, a three-part body (head, thorax, and abdomen), three pairs of jointed legs, compound eyes, and one pair of antennae. Insects include many varieties of species, such as bees, ants, butterflies, mosquitoes, and beetles.

2. **Beetles**: Beetles are a specific type of insect, and they make up the order Coleoptera, which is the largest order of insects. Beetles are characterized by their hardened forewings or "elytra" that cover the back of their bodies and protect their hind wings. Examples include ladybugs, fireflies, and dung beetles.

3. **Terrestrial Arthropods**: This is a broader category that includes all arthropods that live on land. Arthropods are invertebrate animals that have an exoskeleton, a segmented body, and paired jointed appendages. This phylum includes insects, arachnids (like spiders and scorpions), myriapods (like centipedes and millipedes), and crustaceans (though many crustaceans are aquatic, a few like woodlice are terrestrial).

So, to put it simply, all beetles are insects, and all insects are terrestrial arthropods, but not all terrestrial arthropods are insects, and not all insects are beetles.
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