ESB vs application server?

Question

Java

In which case is it necessary to use the service bus, and in which is it sufficient to have its own transport system written using the camel integration framework?
There is an opinion that ESB is just a marketing ploy, since it is actually the same application server, what do you think?

Answer 1

As far as I know, IBM is of the opinion that ESB is a concept and technology, not a specific product. And this technology can be implemented both on the basis of one product, and on a certain set of products.
The technology itself was designed to reduce the web of interconnections between different applications and their components, to centralize and streamline interaction, to simplify the replacement and connection of new components.
Whether this technology is applicable to a specific task needs to be clarified. The choice of a specific architecture and implementation depends on the task.