True or False: You must use a Liquid filter to manipulate output data of a Liquid object.

Using a Liquid filter to manipulate the output data of a Liquid object is indeed a requirement, making the statement true. Liquid filters are essential for transforming and formatting data in Shopify themes. They allow developers to modify variables and display data in a way that suits the store's design and functionality needs.

For instance, if you want to format a date, truncate a string, or convert a number into a currency format, you need to utilize the appropriate Liquid filters. This manipulation enhances the flexibility and usability of the data being displayed, allowing for better control over how information appears to customers.

Filters are not only useful for simple modifications but can also be used in combination with Liquid objects to perform more complex data manipulations. While there are other ways to handle data, such as using JavaScript for client-side operations after the page has rendered, Liquid operates on the server side and requires the use of filters to modify output at the template level during the rendering process.

Given this understanding, the correct answer supports the idea that Liquid filters are integral to managing data output effectively in Shopify theme development.