What is a pending Txn amount on a credit card?

Excuse me, could you please clarify what a "pending Txn amount" refers to on a credit card statement? I'm a bit confused about the terminology and how it affects my account balance. Specifically, I'm wondering if it means that there are transactions that have been initiated but haven't been fully processed or settled yet, and if so, how long does it typically take for these pending transactions to be finalized and reflected in my available credit limit? Also, is there any potential impact on my credit score if I have a significant number of pending transactions? Thank you in advance for your assistance.