Final answer:
Hundreds of external apps are available that can integrate with QuickBooks Online to expand its capabilities and assist in various business processes.
Step-by-step explanation:
The question asks about the types of external tools available that work in conjunction with QuickBooks Online (QBO). The correct answer is: There are hundreds of external apps available that integrate and work with QB Online.
These apps are designed to extend QuickBooks Online's functionalities, providing additional features that can cater to various business needs such as time tracking, inventory management, customer relationship management (CRM), and more. By integrating these third-party applications into their accounting workflow, businesses can automate processes, gain greater data insights, and improve overall efficiency.