Update in-memory-data-structure-store@M-EXrTDeAEMz_IkEi-ab4.md (#7270)

* Update in-memory-data-structure-store@M-EXrTDeAEMz_IkEi-ab4.md

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* Update src/data/roadmaps/redis/content/in-memory-data-structure-store@M-EXrTDeAEMz_IkEi-ab4.md

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Co-authored-by: dsh <daniel.s.holdsworth@gmail.com>

src/data/roadmaps/redis/content/in-memory-data-structure-store@M-EXrTDeAEMz_IkEi-ab4.md

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-# In-memory Data Structure Store
+# In-memory Data Structure Store
+
+An in-memory database is a purpose-built database that relies primarily on internal memory for data storage. It enables minimal response times by eliminating the need to access standard disk drives (SSDs). In-memory databases are ideal for applications that require microsecond response times or have large spikes in traffic, such as gaming leaderboards, session stores, and real-time data analytics. The terms main memory database (MMDB), in-memory database system (IMDS), and real-time database system (RTDB) also refer to in-memory databases.
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+Learn more from the following resources: 
+
+- [@article@Amazon MemoryDB](https://aws.amazon.com/memorydb/)