> For the complete documentation index, see [llms.txt](https://helpdocumentation.gitbook.io/user/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://helpdocumentation.gitbook.io/user/crm-v1-old/contacts/difference-between-conditions-is-is-not-exists-and-does-not-exist.md).

# Difference Between Conditions: “is”, “is not “, “exists” and “does not exist”

* **"is":** Shows only contacts where the custom field matches the specified value. It excludes contacts where the custom field does not exist.
* **"is not":** Displays contacts where the custom field exists but does not match the specified value, excluding any contacts lacking the custom field.
* **"exists":** Includes all contacts having the custom field, regardless of its value.
* **"does not exist":** Identifies only contacts that lack the custom field.

Understanding these conditions ensures accurate filtering without omitting relevant contacts inadvertently.

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