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I went up in difficulty on my Sudoku app. I keep getting mostly through them; however, I keep getting stuck towards the end of the puzzle. An example is shown below. Can I have an explanation of the technique I'm not using?

Edit: Puzzle came from the Enjoy Sudoku app on Android

I went up in difficulty on my Sudoku app (Enjoy Sudoku app on Android). I keep getting mostly through them; however, I keep getting stuck towards the end of the puzzle. An example is shown below. Can I have an explanation of the technique I'm not using?

I went up in difficulty on my Sudoku app. I keep getting mostly through them; however, I keep getting stuck towards the end of the puzzle. An example is shown below. Can I have an explanation of the technique I'm not using?

I went up in difficulty on my Sudoku app. I keep getting mostly through them; however, I keep getting stuck towards the end of the puzzle. An example is shown below. Can I have an explanation of the technique I'm not using?

Edit: Puzzle came from the Enjoy Sudoku app on Android

I went up in difficulty on my sudoku app. I keep getting mostly through them; however, I keep getting stuck towards the end of the puzzle. An example is shown below. Can I have an explanation of the technique I'm not using?

I went up in difficulty on my Sudoku app. I keep getting mostly through them; however, I keep getting stuck towards the end of the puzzle. An example is shown below. Can I have an explanation of the technique I'm not using?