Why are the ad coming without opening a app

If you're experiencing ads appearing on your device without having opened any specific apps, it's possible that there could be a few different reasons for this behavior:

1. Adware or Malware: Adware or malware infections can cause unwanted ads to appear on your device, even when you're not using any specific apps. These malicious programs often integrate themselves into your device's system and display ads in various ways.
2. Push Notifications: Some apps and websites have the ability to send push notifications, even when you're not actively using them. If you've allowed certain apps to send notifications, they might display ads as push notifications.
3. Background Processes: Certain apps might run background processes that trigger ads to appear even when you're not actively using the app. This can be a violation of your privacy and user experience.
4. Browser Hijacking: If you're using a web browser on your device, you might encounter ad-heavy websites that display ads without your direct interaction. This is more common on websites with aggressive advertising practices.
5. System-Level Ads: Some devices, especially if they are budget or ad-supported models, might display system-level ads as part of their default settings. These ads can appear on the lock screen, home screen, or within system menus.
6. Notification Center Ads: Some apps might display ads in the notification center or status bar of your device. These ads can appear even when you're not actively using the app.

To address this issue:

• Check Recent Apps: Check the recent apps menu to see if any unfamiliar or suspicious apps are running in the background. If you find any, consider uninstalling them.
• Review App Permissions: Go through your installed apps and review their permissions. If an app has permissions to display notifications or access the internet, it might be responsible for the ads.
• Scan for Malware: Run a reputable antivirus or anti-malware app on your device to scan for and remove any potential threats.
• Clear Cache and Data: Clear the cache and data of apps that might be displaying unwanted ads. This can sometimes help resolve the issue.
• Uninstall Suspicious Apps: Uninstall any apps that you suspect might be causing the ads. If you recently installed an app and started experiencing the issue, that app might be the culprit.
• Adjust Notification Settings: Review your notification settings for each app and disable notifications for apps that you don't need notifications from.

If the issue persists despite trying these steps, it might be a good idea to seek professional help or contact your device's manufacturer or customer support for further assistance.

This is malware/adware. I had this once an fixed it only by factory resetting the phone