Buy and Sell on the same day

I am holding a Stock & Share ISA account and investing on ETFs.
I have a question, am I allowed to buy and sell the same ETF within a day?
For example, I buy 100 number of shares of a partcilar ETF in the morning and sell 100 number of shares of the same ETF in the afternoon.

Is this allowed? Would there be any tax implications for such transactions from the ISA account? Thank you

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