MySql SQL keys what is MUL vs PRI vs UNI

hi,

in mysql table shows table colums as MySql SQL keys what is MUL vs PRI vs UNI

what is difference between each. what is MUL is it same as foreign key? is it same across all databases?
please advise

MySQL ServerSQL

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Pawan Kumar

8/22/2022 - Mon

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Pawan Kumar

11/11/2017

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M. Ahsan

11/25/2017

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Pawan Kumar

12/14/2017

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