Apple

Relocated Items Relocated Items is a macOS folder created after some system upgrades to hold files the installer could not return to their original locations. System Logs install.log /private/var/log/install.log is a macOS system log that records software installation activity and package installer events. iOS Device Backup 00008140 This folder stores an iPhone or iPad backup created by Finder or iTunes, containing device data snapshots used for restore or migration. Shared /Users/Shared is a macOS shared folder where apps and users can place files intended to be accessible to all local user accounts. Safari Cache This folder stores Safari’s cached web content to speed up page loading and reduce repeated downloads during browsing. Xcode Junk Xcode Logs This folder stores Xcode-related log files in your user Library, typically created during development, builds, debugging, or simulator activity. Xcode Junk Xcode Cache This folder stores cached data used by Xcode to speed up launches, indexing, and other developer workflows on your Mac. Xcode Junk Documentation Cache This Xcode folder stores downloaded documentation and indexing data used to browse Apple developer docs inside Xcode. Xcode Junk Derived Data Xcode DerivedData stores temporary build products, indexes, and intermediate files created while building and debugging projects in Xcode. Xcode Junk Archives Stores archived Xcode build outputs, usually created when you archive apps for distribution, testing, or keeping release snapshots. Xcode Junk iOS Device Support Xcode iOS DeviceSupport stores files Xcode uses to work with specific iPhone and iPad iOS versions during development and device debugging. Xcode Junk Simulator Runtimes This folder stores Xcode CoreSimulator data such as simulator runtimes, devices, and related files used for iOS, watchOS, and tvOS development. Users The /Users folder is the top-level location that stores user home folders and personal data for accounts on a Mac. System The /System folder contains core macOS files and frameworks required for startup, built-in apps, and normal system operation. Applications The /Applications folder is the main place where macOS stores installed apps that are available to all users on the Mac. Usr /usr is a core macOS Unix directory containing commands, libraries, and shared resources used by the system and many apps. Dev /dev is a core Unix device directory on macOS that provides special files used by the operating system and hardware-aware software. Library The /Library folder stores shared macOS and app resources used by all users, including system support files, settings, extensions, and services. Sbin /sbin is a core macOS system folder containing low-level administration tools used during startup, repair, networking, and maintenance tasks. Bin /bin is a core Unix system directory on macOS that holds essential command-line tools used by the operating system and Terminal sessions. System Logs com.apple.xpc.launchd This launchd log file stores low-level macOS service and startup messages that help diagnose background service and boot issues. System Logs DiagnosticMessages This folder stores macOS diagnostic log messages used for troubleshooting system and app issues during normal operation. Private The /private folder is a protected macOS system directory used to hold core Unix-style folders such as tmp, var, and etc. Trash The Trash folder stores files and folders you’ve moved to the Trash in your user account until they are emptied or restored. iOS Backups iOS Backup This folder stores a device-specific local iPhone or iPad backup created by Finder or older iTunes sync and backup features on your Mac. System Cache ColorSync ColorSync cache files help macOS manage color profiles and color conversions for displays, printers, images, and other color-aware workflows. CrashReporter User Logs CrashReporter user logs store app and system crash reports that help diagnose unexpected quits, freezes, and stability problems on a Mac. clang Var Folders Cache This folder is typically a temporary clang compiler workspace or cache created under macOS private var folders during builds. Xcode Junk Xcode Cache This folder stores cached data created by Xcode to speed up development tasks, indexing, downloads, and other routine IDE operations. install.log.15.gz This is a rotated, compressed macOS installer log archive that records past software installation activity for troubleshooting and system history. User Caches This folder stores temporary CloudKit cache data used by Apple’s cloud sync features to speed up syncing and local access. icloudmailagent This folder stores temporary cache data for icloudmailagent, a background component related to iCloud Mail syncing and message handling on macOS. DerivedData DerivedData stores Xcode’s intermediate build products, indexes, and debug artifacts created while compiling and running projects. Archives This folder stores Xcode archives of built apps, often used for distribution, notarization, symbol retention, and restoring older build outputs. iOS DeviceSupport Xcode’s iOS DeviceSupport folder stores device support files used when connecting iPhones or iPads for development and debugging. CoreSimulator CoreSimulator stores data for Xcode’s iPhone, iPad, Apple Watch, and other simulator runtimes used during app development and testing.