Update README.md

README.md

@@ -6,13 +6,13 @@ This project demonstrates the deployment of a multi-container web application us
 It includes:
 - Frontend (Nginx)
 - Backend (Node.js)
-- Database (MongoDB)
+- Database (PostgreSQL)
 - Mongo Express (DB UI)
 
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 ## 🏗️ Architecture
-Browser → Frontend → Backend → MongoDB
+Browser → Frontend → Backend → PostgreSQL
 
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@@ -20,7 +20,7 @@ Browser → Frontend → Backend → MongoDB
 - Docker
 - Docker Compose
 - Node.js
-- MongoDB
+- PostgreSQL
 - Nginx
 
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@@ -31,7 +31,7 @@ Browser → Frontend → Backend → MongoDB
 |----------------|------|
 | Frontend       | 8080 |
 | Backend        | 3000 |
-| MongoDB        | 27017 |
+| PostgreSQL        | 27017 |
 | Mongo Express  | 8081 |
 
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@@ -53,7 +53,7 @@ Browser → Frontend → Backend → MongoDB
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 ## 💾 Persistence
-MongoDB uses Docker volume (mongo-data), so data is محفوظ after restart.
+PostgreSQL uses Docker volume (mongo-data), so data is محفوظ after restart.
 
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