In MetaTrader 5 (MT5), the Navigator is a key panel that provides easy access to various elements of your trading environment. It includes several important features:

1. Accounts: Displays a list of your trading accounts and allows you to quickly switch between them. You can view account details and manage connections. To move from one account to another, double-click on one of the available accounts. You can also right-click on the existing account and select Login to Trade Account, where you will have to enter your login and password. To delete an account, right-click on it and select Delete.
2. Indicators: Lists all the available technical indicators that you can apply to your charts. You can double-click on the chosen indicator, or drag and drop indicators from this panel onto your charts to analyze market conditions. You can additionally add indicators from the main menu by clicking on Insert and selecting Indicators.
3. Expert Advisors (EAs): Shows a list of automated trading scripts (Expert Advisors) that you have installed. You can attach these EAs to your charts for algorithmic trading.
4. Scripts: Contains custom scripts that can perform specific functions or automate certain tasks. You can run these scripts directly from the Navigator. Please note that, unlike Expert Advisors, Scripts do not run continuously with each price tick. Instead, they execute only when requested and will stop automatically once their designated task is completed.

The Navigator helps streamline your trading by organizing and providing quick access to essential tools and resources. This window can be opened/closed by pressing accelerating keys of Ctrl+N, or by the "View – Navigator" menu command.