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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 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? 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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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?

Beginner

Answer

Implicit animations are widgets that automatically and properly animate a genuine smooth transition between an old value and a new value whenever one of their own specific properties actually changes, entirely without requiring you to manually manage any underlying AnimationController yourself, and widgets such as AnimatedContainer, which smoothly animates changes to properties like width, height, or color, and AnimatedOpacity, which smoothly animates a fade transition, let you achieve a genuinely smooth, polished animation simply by changing a given property's own value and letting Flutter itself automatically handle the entire actual underlying animation completely for you.
AnimatedOpacity(
  opacity: isVisible ? 1.0 : 0.0,
  duration: Duration(milliseconds: 300),
  child: MyWidget(),
)
Real-world example A notification banner uses AnimatedOpacity to smoothly fade itself in when it first appears and smoothly fade back out again when it is genuinely dismissed, achieving a genuinely polished visual effect using just a single simple property change.

Common follow-ups: What genuinely other implicit animation widgets besides AnimatedContainer and AnimatedOpacity does Flutter already provide?;What genuinely happens if you change an implicit animation's target value again while it is still actively mid animation?

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