A tech stack is a collection of tools, services, and technologies used in a project, including coding languages and frameworks, which defines the types of apps that can be built and how customizable they are. Choosing the right tech stack is crucial as it affects the amount of time and resources required for app development. Traditional tech stacks require custom software development, which can be slow and expensive, while no-code tech stacks offer agility, ease, and speed in developing applications without specialized training or certifications. No-code tech stacks have pre-built integrations and robust communities, such as Bubble, which handles front-end and back-end processes, connects to other services using the API Connector, and provides a powerful point-and-click web editor and cloud hosting platform for building fully customizable web applications and workflows.