Currently we can consider that Zcash is the main currency oriented to privacy. It was launched at the end of 2016 and like Monero anonymity is its spearhead.
Zcash uses an algorithm called zero-knowledge proofs (zero knowledge protocol) which allows to hide the identities of senders, receivers and the quantity sent.
The trajectory of Zcash is curious since it was born from the Zerocoin - project which aimed to add a layer of cryptographic anonymity for the Bitcoin but as they say one thing led to the another and so it ended up becoming an independent cryptocurrency.
One of its major differences is that despite of being open source, it is not managed by the community as usual, but it is managed by a company like it occurs with Ripple.
If you want to know in which Wallet to store your Zcash we recommend you take a look at this article where we recommend the most recognized Wallets of this cryptocurrency.
To track any Wallet or transaction made with ZEC you just have to access this website, it is an explorer which gives you the available information of the transactions.