Opera Mini 7.5.1 is a legacy version of the Opera Mini web browser, released in the mid-2010s (approximately 2015–2016). This APK (Android Package Kit) targets older Android devices (typically Android 2.3 Gingerbread to 4.4 KitKat) and low-resource environments. It is not the modern Opera Mini (which is now at version 80+), but rather a historical build known for extreme data compression.