You can access Kintone from Chrome for Android or the mobile app. You can use your mobile device to check notifications or post on Kintone anytime, even when you are on the go and there is no PC available.

If your Kintone is customized with API and JavaScript or if you want to use multiple tabs, Chrome for Android is suitable for your needs.
On the other hand, the mobile app allows you to receive push notifications.
Use whichever suits your usage better. You can also use both of them.

For details on how to use the mobile view on Chrome for Android, refer to Using Kintone on Chrome for Android.
For details on how to use the mobile app, refer to Using Kintone Mobile App for Android.