Eclipse SDK 4.25 (64-bit) is a 64-bit version of the Eclipse Integrated Development Environment (IDE) software, specifically release version 4.25.

Let[SQ]s break that down :

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Eclipse:

A widely used, open-source IDE. It[SQ]s not an application itself, but rather a platform upon which various development tools can be built. It[SQ]s highly extensible, meaning you can add plugins to support various programming languages and development tasks.

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SDK (Software Development Kit):

This means the Eclipse release includes the core platform *plus* a set of common tools needed for software development. This generally includes things like compilers, debuggers, and other basic utilities, making it ready to use for coding right out of the box. A "plain" Eclipse download might only include the platform itself; you[SQ]d need to install additional plugins to get the full SDK functionality.

* 4.25:

This is the version number of the Eclipse release. Each release contains bug fixes, performance improvements, and sometimes new features.

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(64-bit):

This specifies that the software is compiled to run on a 64-bit operating system. 64-bit applications can access and utilize more RAM than 32-bit applications, which is beneficial for larger projects and more resource-intensive tasks.

In short, Eclipse SDK 4.25 (64-bit) is a fully-featured, 64-bit version of the Eclipse IDE, ready for software development on a 64-bit system. While it[SQ]s a general-purpose IDE, it often requires additional plugins to provide support for specific programming languages like Java, C++, Python, etc.