Syllogism: a necessary result from suitable general and particular premises.
Every bird is living; a pigeon is a bird; therefore a pigeon is living.
Induction: a generalization from several observed cases.
A property appears in many plants of a kind; a general rule is proposed.
Analogy: a judgment about one particular extended to another through a relevant shared basis.
One device's known feature supports an inference about a comparable device.
The principal differences are necessity, generalization, and particular-to-particular transfer, respectively.