All 7 Implicit vs Explicit Animations questions
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What are implicit animations in Flutter, and how do widgets such as AnimatedContainer and AnimatedOpacity let you achieve a genuinely smooth animation with genuinely minimal required code? What are explicit animations in Flutter, and why might you genuinely need to use one instead of simply relying entirely on a considerably simpler implicit animation widget? How can you properly convert a piece of code originally written using an implicit animation over to using an explicit animation instead, once your particular given animation's own requirements have genuinely grown considerably more complex over time? How do you properly and correctly manage several separate implicit animations together within exactly the same single widget, ensuring each individual one properly and correctly animates completely independently as its own genuinely underlying separate value actually changes? How does the TweenAnimationBuilder widget genuinely let you achieve a considerably more custom implicit animation effect, without actually needing to fully write out an entirely separate fully custom implicit animation widget class completely from scratch yourself? What are the genuine practical performance tradeoffs of using several separate simpler implicit animations compared to using one single, considerably more complex coordinated explicit animation for a genuinely elaborate combined multi part visual effect?
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How does the specific curve parameter available on both implicit and explicit animations genuinely let you meaningfully control the actual pacing and overall feel of a given animation, beyond simply relying entirely on a plain, constant linear speed?

Intermediate

Answer

Both implicit animation widgets and explicit Tween based animations accept a curve parameter that genuinely defines exactly how that particular animation's own progress actually changes relative to its overall elapsed time, letting you achieve effects such as an animation that starts out relatively slowly and then noticeably accelerates, or one that produces a genuinely bouncy, distinctly playful feeling, and thoughtfully choosing an appropriately fitting curve for a specific given animation, rather than simply always using the plain default linear curve, can meaningfully and noticeably improve exactly how genuinely natural and polished that resulting animation actually feels to a user.
AnimatedContainer(
  duration: Duration(milliseconds: 400),
  curve: Curves.easeOutBack,
  width: isExpanded ? 300 : 100,
)
Real-world example An expandable card widget uses the easeOutBack curve specifically on its AnimatedContainer, producing a subtly playful, genuinely pleasing slight overshoot effect as the card smoothly expands, considerably more visually appealing than using the plain default linear curve instead.

Common follow-ups: What genuinely other commonly used curves besides easeOutBack does Flutter already provide out of the box?;Can you actually create your own genuinely fully custom curve if none of Flutter's own existing built in options genuinely quite fit your particular specific needs?

Flutter Animations Basics;Custom Widgets & Reusable Components
All 7 Implicit vs Explicit Animations questions