Every app and site is made up of lots of different tech tools and languages. Like a house, one part is built on top of another and they need each other to function. If one part of the structure breaks, the rest can fall down too.

These are called dependencies. To keep a product working, all the dependencies need to work together. This is part of the invisible work that software engineers do.

Learning notes from this episode:

A tech stack describes all the tools and programming languages used to build an app or a site. Some of those tools are custom made, some are rented as licences and others plug you into a bigger ecosystem.
Examples of bigger eco-systems that many products depend on are the Apple App Store, Google Play and Amazon Web Services. If one of these ecosystems has a problem, the apps and sites they support will have issues too. An app on the Apple App Store depends on Apple, hence the term dependency.
Product teams have to update their products to keep up with the changes in the external tools that make up their product. If Apple has an update, all the apps on the Apple App Store have to keep up with the changes.

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