--- title: Medium | daily.dev description: A beginner-friendly introduction to AWS Lambda covering what it is, how it works internally (cold starts, warm starts, execution environments), event triggers,... canonical: https://daily.dev/posts/medium-zrfshok4c twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Medium | daily.dev og:description: A beginner-friendly introduction to AWS Lambda covering what it is, how it works internally (cold starts, warm starts, execution environments), event triggers,... og:url: https://daily.dev/posts/medium-zrfshok4c og:image: https://api.daily.dev/og/posts/zRfshok4c.png og:image:alt: Medium og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Medium **[Medium](https://daily.dev/sources/medium_js)** · 5 min read · 0 upvotes · 0 comments ## Summary A beginner-friendly introduction to AWS Lambda covering what it is, how it works internally (cold starts, warm starts, execution environments), event triggers, automatic scaling, pricing model, advantages, limitations, and best practices. Explains Lambda Functions and Lambda MicroVMs as two compute primitives, and walks through a practical contact form example to illustrate the event-driven execution flow. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [AWS Lambda](https://daily.dev/posts/aws-lambda-nmgvbaj4o) · Towards Dev · 0 upvotes · 0 comments - [You’re Paying for Servers You’re Not Using. AWS Lambda Fixes That.](https://daily.dev/posts/you-re-paying-for-servers-you-re-not-using-aws-lambda-fixes-that--pbzq6ixun) · Medium · 0 upvotes · 0 comments - [What you need to know about Lambda MicroVMs](https://daily.dev/posts/what-you-need-to-know-about-lambda-microvms-rwfw6wahz) · theburningmonk.com · 53 upvotes · 3 comments --- Tags: [#cloud](https://daily.dev/tags/cloud), [#aws](https://daily.dev/tags/aws), [#architecture](https://daily.dev/tags/architecture), [#serverless](https://daily.dev/tags/serverless), [#aws-lambda](https://daily.dev/tags/aws-lambda) [View this post on daily.dev](https://daily.dev/posts/medium-zrfshok4c) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Medium","url":"https://daily.dev/posts/medium-zrfshok4c","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/medium-zrfshok4c"},"datePublished":"2026-07-22T07:31:15.980Z","dateModified":"2026-07-22T07:31:39.269Z","description":"A beginner-friendly introduction to AWS Lambda covering what it is, how it works internally (cold starts, warm starts, execution environments), event triggers,...","image":"https://media.daily.dev/image/upload/s--foaA6JGU--/f_auto/v1722860399/public/Placeholder%2004","thumbnailUrl":"https://media.daily.dev/image/upload/s--foaA6JGU--/f_auto/v1722860399/public/Placeholder%2004","isAccessibleForFree":true,"articleSection":"Medium","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Medium","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/medium","url":"https://daily.dev/sources/medium_js"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/medium-zrfshok4c","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"cloud,aws,architecture,serverless,aws-lambda","timeRequired":"PT5M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Medium","item":"https://daily.dev/sources/medium_js"},{"@type":"ListItem","position":3,"name":"Medium"}]} ```