Definition
Calling autism a spectrum means autistic traits and support needs vary widely from person to person and within the same person over time. It is not a straight line from 'a little autistic' to 'very autistic'; it is a range across many different dimensions at once.
Why It Matters
How the spectrum is understood shapes expectations. Picturing it as many independent dials, sensory, social, motor, communication, explains why two autistic people can be nothing alike and why one person can be highly skilled in one area and need significant support in another.
Common Misconception
The spectrum is not linear and not a severity ranking. 'Everyone is a little autistic' misunderstands it: the spectrum describes variation among autistic people, not a trait everyone shares.