Compare Ahead-of-Time and Just-in-Time.
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What is the difference between AOT and JIT compilation?
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compilationaot
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JIT compiles templates in the browser at runtime — handy for development. AOT compiles templates during the build, so the browser ships pre-compiled code: faster startup, smaller bundle (no compiler shipped), and template errors caught at build time. AOT is the production default.
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AOT is the default build
# Production build → AOT-compiled, optimized, tree-shaken
ng build --configuration production
# Templates compile at BUILD time, so an error like a typo'd binding
# <p>{{ titel }}</p> <!-- property 'titel' does not exist -->
# fails the build (AOT) instead of silently breaking at runtime (JIT).
# Since Angular 9 (Ivy), 'ng serve' also uses AOT by default.05
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