# Light Clients and SPV Processes Transactions are a means used to write on to the Bitcoin Ledger. In the [Broken mention](broken://pages/MUJ5qYE0d75yiHJMYvna) topic we saw how various layers serving applications can be built on top of the core network of nodes which provide the base infrastructure. In this section, we will explore in depth the Simplified Payment Verification Process and its usage in applications known as light clients for the node network (which acts as a server of blockchain processes for these applications). Firstly, we will explore the concept of SPV and its core features. We will then look at how it's applied in the real world and show how it is used for building light client applications. {% hint style="info" %} Light clients are also sometimes referred to as SPV Overlay. All the applications that interact with blockchains fall under this category. It is the SPV clients which make a blockchain decentralised as they will be recording all block headers ensuring the blockchain's integrity {% endhint %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://protocol.bsvblockchain.org/light-clients-and-spv-processes.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.