Transactions are being synced. After sending Bitcoin to another address, my transaction shows as synced.

A transaction is considered to have occurred when it is included in a new page of the list of all Bitcoin transactions.

Each page in the list is called a “block.” The list itself is a transaction journal called the Bitcoin “blockchain”.

Any Bitcoin wallet, working as originally intended by Bitcoin’s inventors, communicates with several nearby wallets (or other “nodes” in the Bitcoin network) to report new, unconfirmed transactions and a transaction journal (block). Find out about a new page (block) in the chain. They each keep a copy of the entire list from Bitcoin’s inception in 2008. This process is called “synchronization.”

Some wallets may discard old blocks that they are no longer interested in. This is called pruning. It’s not really relevant to your situation, but if you don’t mention it, someone may feel the need to point this out.

By communicating with others on the network, your wallet can discover that it is lacking details of recent transactions and notify you that it is “synchronizing.”

When you ask someone to pay you money in your wallet. The wallet creates transactions called unconfirmed transactions. This is like a draft deal.

An unconfirmed transaction is considered to have actually occurred only when a miner adds it to a new page (block) in the transaction list (blockchain). This is called transaction confirmation.

You may not know the details of your recent transactions until your wallet syncs, so you may not yet know the results of your recent transactions.