From the notification settings in App settings, you can set notifications to be sent when a certain action is performed on a record or a certain condition is satisfied by record data.

Notifications are sent to app users in the following cases:

• General notifications
  Notification is sent when a certain action is performed on a record.
  Example: When a record is added to an app
• Per record notifications
  Notification is sent when record data satisfies a certain condition.
  Example: When the amount of over one million yen is entered to a expense item
• Reminder notifications
  Notification is sent at a certain time (e.g., 7 days before, 3 days after) based on the date and time specified in the record.
  Example: When one of the dates passes the date entered in a due date item for To-Dos

For notification recipients, departments, groups, or users can be specified.
When a "User selection," "Department selection,"or "Group selection" field is placed on a form, you can also specify users selected in the field as recipients.​​​​​​
Reference: Tips: Notification recipients selectable from the "Add a field of the form" drop-down list

By default, a notification is sent to the following users when a comment is posted on a record.

• A user who created the record
• A user who last updated the record
• Users who have previously posted a comment on the record

App notifications are displayed on the Portal (the main page of kintone) or the "Notifications" screen.​​
Notifications are sent out in cases such as when a record is edited or its status is changed.

To check the details of the change made to a record, open the relevant record.