Following is the list of default directories in TYPO3 installation:

fileadmin/

This is a directory in which users can store files. Typically images, PDFs or HTML files appear in this directory and/or its sub directories. Often this directory is used for downloadable files. This directory is the only one accessible using the TYPO3 File module.

typo3/

TYPO3 Backend directory. This directory contains most of the files coming with the TYPO3 Core. The files are arranged logically in the different system extensions in the sysext/ directory, according to the application area of the particular file. For example, the “frontend” EXTENSION amongst other things contains the “TypoScript library”, the CODE for generating the Frontend website. In each system extension the PHP files are located in the folder Classes/. Additionally, typo3/ can contain some GLOBAL extensions in the ext/ directory (which is not used by the TYPO3 core itself).

typo3conf/

TYPO3 configuration directory

typo3conf/ext/

Directory for TYPO3 extensions. Each subdirectory contains one extension.

typo3temp/

Directory for temporary files. It contains subdirectories for temporary files of extensions and TYPO3 components.

UPLOADS/

Default upload directory. Extensions can use the uploadfolder setting in ext_emconf.php to specify a subdirectory of uploads/ for this extension.

Following is the list of default directories in TYPO3 installation:

fileadmin/

This is a directory in which users can store files. Typically images, PDFs or HTML files appear in this directory and/or its sub directories. Often this directory is used for downloadable files. This directory is the only one accessible using the TYPO3 File module.

typo3/

TYPO3 Backend directory. This directory contains most of the files coming with the TYPO3 Core. The files are arranged logically in the different system extensions in the sysext/ directory, according to the application area of the particular file. For example, the “frontend” extension amongst other things contains the “TypoScript library”, the code for generating the Frontend website. In each system extension the PHP files are located in the folder Classes/. Additionally, typo3/ can contain some global extensions in the ext/ directory (which is not used by the TYPO3 core itself).

typo3conf/

TYPO3 configuration directory

typo3conf/ext/

Directory for TYPO3 extensions. Each subdirectory contains one extension.

typo3temp/

Directory for temporary files. It contains subdirectories for temporary files of extensions and TYPO3 components.

uploads/

Default upload directory. Extensions can use the uploadfolder setting in ext_emconf.php to specify a subdirectory of uploads/ for this extension.