Clarizen is a web-based collaborative project management software that allows users to track time and expenses, manage tasks and documents, and generate various reports. It provides features such as timesheets to record billable work hours, expense sheets to track project-related costs, and a navigation panel for easy access to these and other functions. The document outlines how to login, navigate, fill out timesheets and expense sheets in Clarizen, and answers some common questions about using the software.