# Why do you want to build a blockchain on Polkadot?

<figure><img src="/files/2HIyZNO8CGepatx8nWiS" alt=""><figcaption><p>If you search on Google: "Is building a blockchain hard?"</p></figcaption></figure>

Building a blockchain is not an easy process. You can take a 4 months bootcamp to learn how to build a fullstack web application. However, with blockchain engineering, it requires strong foundational knowledge in computer science, networking and cryptography to build something that is usable by the industry.&#x20;

<figure><img src="/files/I8ZI4flo4wPV0fn7HA4K" alt=""><figcaption><p>There are a lot of domain specific knowledge to build a blockchain <br>that is beneficial to the industry</p></figcaption></figure>

**Polkadot SDK** provides a framework for you to use to build a blockchain easily without caring much about other primitvie knowledge and low-level engineering like cryptography, virtual machine, database...and only need to focus on building what matters to the logic of the blockchain. This is so-called application specific blockchain.&#x20;

<figure><img src="/files/F1F8le6YcUACAbaqWc9e" alt=""><figcaption><p>Substrate Client is a game console while the logic built on top of it is <br>a game catridge that only need to plug and play</p></figcaption></figure>

And there is another anology I really like is the LEGO bridge analogy:&#x20;

<figure><img src="/files/txG2wDzEWSjISutOz1fn" alt=""><figcaption><p>Building a blockchain with Substrate is like playing LEGO<br>What you want to build is a complete LEGO house aka a blockchain<br>And what you have is single solid LEGO bridge aka a Substrate framework</p></figcaption></figure>

<figure><img src="/files/rdkrBpLxaw3Dp7xpPqAY" alt=""><figcaption><p>You just simply add these small blue LEGO bridge on top of your Substrate LEGO bridge.<br>And BAMP! You have a complete blockchain</p></figcaption></figure>

## Benefits of building a blockchain on Polkadot

{% embed url="<https://docs.google.com/presentation/d/1OMcIuihsdrBaMGlQvGkYPTsUDfA1VQ0oXvAG5VfdPmQ/mobilepresent?slide=id.g2d41f1c3107_1_240>" %}

<figure><img src="/files/MWMBhndfbhhHzIjD5dpa" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/eMuwkv3IbChWA8yweC3r" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/PG8oPuevFX2pBOFxvFax" alt=""><figcaption></figcaption></figure>


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