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A TYPO3 extension is an extension of the TYPO3 base, which contains functions that are not available in the normal TYPO3 core. An extension can fulfill completely new tasks or supplement existing functions with additional features. Extensions can be installed via the Extension Manager.

A TYPO3 extension can take over functionalities in the core, the backend and/or the frontend. After integrating an extension, an additional TYPO3 module (https://www.sgalinski.de/en/typo3-agency/typo3-documentation-website-base/backend-modules/) can often be found in the backend. Sometimes new content elements (https://www.sgalinski.de/en/typo3-agency/typo3-documentation-website-base/content-area-contents/) are added.

Like TYPO3, TYPO3 extensions are written with PHP. And also we have already programmed some TYPO3 extensions, which are still developed and maintained. Partly these are available as open source projects (https://www.sgalinski.de/en/open-source/).

A template engine is generally a software that processes templates and replaces placeholders contained therein with content. TYPO3 Fluid is a template engine for TYPO3 extensions based on Extbase.

TypoScript is a configuration language for TYPO3 that controls the output of TYPO3 content in the frontend and backend.

With TypoScript different commands are strung together, which then fills the TYPO3 internal structure. The TypoScript code is stored in template records, which are stored in the database table under sys_template.

A redirect is an automatic forwarding of a URL to another URL. Someone who calls up a certain web address is thus usually redirected to another address without noticing it and without having any influence on it.

Redirects are used, for example, to avoid duplicate content or ensure that outdated pages can no longer be called up, but users are automatically taken to new content.

There are several types of redirects:

• 301 Redirect: permanent redirection 
  • e.g. old URL to be permanently replaced by new URL
• 302 Redirect: temporary forwarding
  • e.g. for promotions (discount, coupons or similar), where old URL is to be used again after the promotion.
• 307 Redirect: temporary forwarding
  • e.g. for server maintenance

IDE stands for Integrated Development Environment. IDEs are software for the creation of applications, which contains a collection of important tools for application development and thus simplifies the development work.

A task runner is a program that automates processes that would have to be performed manually without its use. Tasks that have to be executed repeatedly can be automated in this way, e.g. a process that is to be executed whenever a file is changed. Automation speeds up processes, which makes it possible to work more efficiently.

Users themselves determine which tasks are to be performed by the task runner and which are not.