The SalesforceA mobile app is intended for Salesforce Administrators to be able to perform common tasks on the go. This app enables you to reset user passwords, freeze user accounts, assign users to permission sets, access Release Notes and more. Available on iOS and Android, check this lecture out to learn more about SalesforceA - which is a key component to Mobile Administration on the Salesforce Platform (and likely to make an appearance on your Administrator Certification Exam).
SalesforceA for iOS on the App Store - https://apps.apple.com/us/app/salesforcea/id731117958
SalesforceA for Android on Google Play - https://play.google.com/store/apps/details?id=com.salesforce.admin1&hl=en