# Purpose of ID in Keys

**URL:** <https://forum.flow.com/t/purpose-of-id-in-keys/3611>\
**Category:** Uncategorized\
**Created:** [September 23, 2022, 11:46pm UTC](https://forum.flow.com/t/purpose-of-id-in-keys/3611 "2022-09-23T23:46:29Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![phrozenzero](https://avatars.discourse-cdn.com/v4/letter/p/8491ac/32.png) [@phrozenzero](https://forum.flow.com/u/phrozenzero)\
**Post date:** [September 23, 2022, 11:46pm UTC](https://forum.flow.com/t/purpose-of-id-in-keys/3611/1 "2022-09-23T23:46:30Z")

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Hi,  
I am looking at the docs [here](https://developers.flow.com/learn/concepts/accounts-and-keys) and had a few questions.

There is a section explaining ID as below  
`ID (used to identify key within an account)`

and then in the section below there is an example of weight:  
`Key ID: 1, Weight: 500 Key ID: 2, Weight: 500 Key ID: 3, Weight: 500`

I had few questions related to it:

- If there are multiple keys is weight required?
- What if I create multiple keys with different ID but same public key?
- Is there any reason for introducing ID, if public key serves the purpose; ID seems redundant if weight is not specified/required or used.