If you mean the fake bokeh that blurs the background, turn off portrait mode.
You can toggle "pro raw" in the default camera app. It captures a lot more information from the sensor. The files are a lot larger, it isn't throwing away information that isn't visible like in the shadows. This gives you more flexibility like changing color balance and exposure after the fact because of that extra data. But there is still some sharpening and post processing.
You can use the camera app inside lightroom or "procamera" or other apps and take raw photos, where it records all of the sensor data without any post processing. Most people don't want this, you need to develop the images using software like lightroom to look good.
You can toggle "pro raw" in the default camera app. It captures a lot more information from the sensor. The files are a lot larger, it isn't throwing away information that isn't visible like in the shadows. This gives you more flexibility like changing color balance and exposure after the fact because of that extra data. But there is still some sharpening and post processing.
You can use the camera app inside lightroom or "procamera" or other apps and take raw photos, where it records all of the sensor data without any post processing. Most people don't want this, you need to develop the images using software like lightroom to look good.