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In simplest terms, a node is a device or data point in a larger network. A computer, a phone, or even a printer are considered nodes.

In order to carry out an operation, a blockchain relies on its nodes for their computing power. These operations and their complexity can vary. Each node is tasked with taking care of one of them. In a blockchain, all nodes are connected to each other and they constantly exchange the latest blockchain data with each other so all nodes stay up to date. They store, spread, and preserve the network data.

Masternodes are heavier and may have additional powers compared to normal nodes. In addition to validating, saving, and broadcasting transactions, Masternodes sometimes also facilitate other events on the blockchain depending on their nature. These events include governing voting events, providing execution of protocol operations, and enforcing the laws of the according to the blockchain.

How to run a masternode? https://pantograph.io/what-are-nodes/

So in each Proof-of-Stake blockchain, there might be only a limited number of these Master Nodes?
I think this is an innovation compared to the early Proof-of-Work blockchains that have been showing many limitations.
But what will happen if one of these Master Nodes run into errors and you do not have an alternative Master Node right away?

CMIIW.

For those POS coins, they can have as much nodes as they can. And masternodes are requiring a certain amount of holding and basically not everyone can afford to have it.

And that causes it to become limited.

And it's safer and more secure to have many people able to easily run full Blockchain nodes. Full nodes give them the advantage of adequate  control over their coins, participating in network consensus, benefiting from important features of Blockchain/decentralized-tech like anonymity/privacy, censorship resistant, etc.

POS was not always using masternode. As someone said above as there was no limitation but that depends on how good the profit margin when you are become the masternode. People will not use a lot of money to be a masternode if that was not even profitable.

that's why the masternode coin will have another option like it will let miners to help to secure the network too. In masternode service and what means of POS is proof of service and it's not proof of stake.

I've learnt something new about blockchain nodes. Nodes seems like the life wire that joins every system together, enabling the communications needed for the blockchain to strive to be established. I've heard of masternodes severally and I really didn't know that there are lesser versions which are the nodes. Is there any project that uses the nodes as against the masternodes?

Ah the good old days of DASH masternodes.
My friend was running a dozen of these nodes when DASH was like few cents. Then DASH went up crazy to like $6 and he sold.
Boy, was he sorry once DASH hit $600+ in 2017 :D

Well, that's kind of regretting if ever your friend sold early than the all-time high.
 
It's still good as it is today but not anymore with that ATH price. I'm interested to have its masternode but I just can't because it's too expensive for me. The price of it on March 2017 was $100 and during December 21, 2017 which was the bull market.

The price stood at $1,500.

Node : taken from the Latin (nodus), nodes are the points that connect one device to another. It can be said that nodes are the foundation that enables a technology to work. However, the nodes may vary depending on the network and layer protocols. A physical network node is an active electronic device attached to the network. Its function is to create, send and receive information via communication channels.

You can find some more complete information in this thread :
(GUIDE) Masternode, Node, Full Node / Masternode setup with screens. (https://bitcointalk.org/index.php?topic=5120117.0)

If i remember correctly, when DASH was at $600, a masternode would require around $300k worth of coins to be running.
But who knew, right?

I don't know how much it would be but it's expensive in reality and whether it has corrected and it becomes below $100.

The mere fact is that, I'm not still able to avail a master node of it.

The answer is almost perfect, but I'd like to add that to set up a node requires a large amount of money to be able to set up a node. Each node has a monthly operating cost and the cost depends on the characteristics of the blockchain, it consumes spatial data to store the blockchain of the blockchain that the node is operating. It also costs similar to the cost of electricity that miners mine cryptocurrencies.