what is Progressive and ICC Profile on save for web?

[Fajar5E4A]

Hi guys, so when i want to save my design to jpg using save for web menu, i found two little option which is Progressive and ICC Profile. What is this two option actually do? 
I need to save my illustration to jpg to post it on instagram, which option is best for me?

I attached the screenshot down below, and also thank you very much guys 😄

[Doug A Roberts]

'Progressive' means that the image loads in successive waves (i.e. it will appear to get less pixellated as it loads as a whole, rather than appearing top-to-bottom).

'ICC Profile' will include a colour profile with the image.

I can't imagine Instagram honours either of these settings as it applies its own conversions when you upload your image.

[Fajar5E4A]

so when i checked progressive, the jpg will load as a whole piece of an image without displaying the loading pixel

and when i unchecked it, when i open the jpg, it will open the image from top to bottom and displaying the loading pixel process?

what is this ICC Profile do to the jpg? What is the actual function or purpose to enable this ICC Profile?

[Doug A Roberts]

This is a fair descripion:

https://www.liquidweb.com/kb/what-is-a-progressive-jpeg/

But as I said I don't think it will have any affect on something you upload to Instagram.

Colour profiles are instructions to different devices to interpret the colour in an image.

https://en.wikipedia.org/wiki/ICC_profile

Again, I doubt Instagram honours them.