Hi,
Transactional replication uses Log Reader Agent and Distribution Agent to deliver data changes and schema modifications made on the publisher to the subscribers in almost real time. All data changes will be transaction-based, in the order in which they occur on the publisher, and then applied to the subscriber.
The Log Reader Agent monitors the transaction log of each database configured for transactional replication and copies the transactions marked for replication from the transaction log into the distribution database, which acts as a reliable store-and-forward queue. The Distribution Agent copies the initial snapshot files from the snapshot folder and the transactions held in the distribution database tables to Subscribers.
https://learn.microsoft.com/en-us/sql/relational-databases/replication/transactional/transactional-replication?view=sql-server-ver15
View Replicated Commands and Information in Distribution Database.
https://learn.microsoft.com/en-us/sql/relational-databases/replication/monitor/view-replicated-commands-and-information-in-distribution-database?view=sql-server-ver15