The following are some of the Bitcoin blockchain explorer web applications which can be used to search the transactions, addresses, and blocks and determine the relationships between them.
- Blockchain Info

Figure 1. Blockchain.info Bitcoin Explorer
- Bitcoin Block Explorer

Figure 2. Blockexplorer Bitcoin Explorer
- Insight Bitpay

Figure 3. Insight Bitpay Bitcoin Explorer
- BlockCypher

Figure 4. Blockcypher Bitcoin Explorer
- Blocktrail BTC

Figure 5. Blocktrail Bitcoin Blockchain Explorer
- NeoTrackerd

Figure 6. Neotracker Bitcoin Blockchain Explorer
Pay attention to some of the following:
- Height: Height of the block (491105); It implies that 491104 blocks have already been added.
- Age: Block got created 5 minutes back
- Transactions: Number of transactions included in the block
- Size: Size of the block
- Relayed By:
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I found it very helpful. However the differences are not too understandable for me