Which Liquid operator is used to check for the presence of a substring inside a string or array? 🔍

### Explanation The `contains` operator in Liquid is used to check for the presence of a substring inside a string or array. Key points: - Used in conditional statements like `if` and `unless` - Case-sensitive comparison - Example usage: ```liquid {% if product.title contains 'Pack' %} This product's title contains the word Pack. {% endif %} ```