A crypto node is a computer that is part of a blockchain network. It maintains the latest record of transactions and ensures that all participants adhere to the network's rules. 

- Nodes serve multiple purposes within a blockchain network. They are the backbone of the decentralized architecture, ensuring that the network remains operational and secure without relying on a central authorit. 

- The primary responsibility of nodes is to validate new transactions and blocks, which involves checking the authenticity and correctness of the data. This validation process helps prevent fraud and ensures that only legitimate transactions are added to the blockchain.

- Furthermore, nodes communicate with each other to propagate new transactions and blocks, maintaining the network's resilience and efficiency.

1. Full Node

A full node stores a full copy of the network’s digital ledger. These types of crypto nodes  build the foundations for most blockchains; storing the history of the chain and communicating with other full nodes. 

2. Miner Nodes 

Miner nodes are the participants responsible for verifying transactions and adding them to the blockchain on a proof-of-work blockchain. 

3. Validator Nodes

Validator nodes are similar to miner nodes, but on a proof-of-stake network instead: They also validate transactions and create blocks. However, they don’t have to solve complex computational puzzles, they are chosen in relation to the amount of funds they lock in the system.

4. Light Nodes

These types of nodes do not store the entire blockchain like their heavyweight counterparts. Instead, they just download ‘block headers’. Without getting too technical, it means they don’t require as much storage capacity. Instead, these crypto nodes’ only task is to verify transactions in the blockchain using simplified payment verification (SPV). It’s important to note that not all blockchains use these types of nodes. Mainly, they are popular in blockchains that have limited storage space per block, such as Bitcoin.

1. A higher number of nodes leads to greater security and trust within the network.

2. Nodes work together to prevent double-spending and other fraudulent activities.

3. The decentralized nature of nodes protects against centralized control and censorship.

4. Regular updates and maintenance by nodes ensure that the network remains resilient to technical issues.

5. Nodes help in fostering a transparent environment where all transactions can be audited and verified