What are the differences between ERP and CRM systems?

Question

ERP

For the last couple of months, I have been wondering about automating business processes. Having studied many sites on automation systems, I did not understand the name of what I need. On the one hand, it requires maintaining a client base, accounting for employees, ordering, inventory, the ability to integrate telephony (Asterisk), reports and sales analysis. All this seems to fit into the framework of CRM.
But at the same time, accounting or something similar is also needed - for example, you need to calculate how much the seller will receive from the total shaft, which supplier, what other expenses may be in order to calculate the net profit. It all seems to be related to ERP.
It is also very important that the system lends itself to development. I can't say with certainty what features I'll need in the future. But I don't want to redo everything from scratch.
So the question itself is: what can be called a CRM system, and what is an ERP system, what are their mutually exclusive differences?

Answer 1

The boundaries between systems are blurred, and even specialists often find it difficult to qualify the system. Plus, there are platforms on the basis of which a system of almost any class can be created.
CRM is not related to the warehouse, it is a relationship management system, at least it is customer cards, call history and correspondence.
ERP is not accounting, it is resource management, by and large, this system may not do anything at all in the form of a gui, but be a collector, analyzer and manager for other systems.
Warehouse management is a WMS, but it is not just inventory, but warehouse management as a separate unit, with order picking, address storage, etc. etc.
There are still a huge number of systems of other classes.
It is important to understand what you are starting from.
If you need bookkeeping, and would also like to see the balance in the warehouse, plus customer cards. You can take an accounting system and stick the necessary modules to it, or take modules on the same platform.
If you need CRM, but you already have accounting, and you need advanced CRM, you can make an exchange with accounting, plus screw on the minimum warehouse balance module.
Etc.
In any case, you can either write a monster (yourself or order it), you can do it from scratch, you can use a ready-made platform (Navision, SAP, 1C SCP), or patchwork automation, when each module is separate, and they all exchange data with each other, this can also be done on a ready-made platform, or buy various products for various needs, and then link them together through custom-configured standard exchange gateways.
Personally, I don't like monsters, and to be honest, I don't like monsteroid platforms.

Answer 2

If I were you, I would formulate the question more specifically: what should I use for, say, inventory control in an online store with 10 employees.
The answer to the original question: the difference in functionality. There is no single classification. There is no one-size-fits-all solution. Inexpensive highly specialized systems are usually significantly better in terms of functionality than relatively inexpensive universal ones. Moreover, the more versatile the system, the more expensive it is.