Startup items are the Apps that automatically start or launch when OSX finishes booting up,
Startup items on OSX are called ‘Login Items’.
This feature is helpful when you want to launch app automatically without you doing anything at OSX boot time. Apps like Safari or iTunes would be helpful when you want to listen to music or browse the website without manually launching the app after OSX finishes booting up.
Here is how to manage Startup items or Login items:
Step 01: Launch ‘System Preferences’
Step 02: Go to Users & Groups > Select your user name > at right hand panel click on Login items tab
Step 03: To delete existing login item select it & click minus at bottom
Step 04: To add new login item click on plus sign at bottom & navigate to particular app at Application folder that you want to launch at start up
Hope it helps,
Thanks & Regards