---
title: "Memory vs RAG: Understanding the Difference"
description: "Learn why agent memory and RAG are fundamentally different, and when to use each approach"
sidebarTitle: "Memory vs RAG"
---

Most developers confuse RAG (Retrieval-Augmented Generation) with agent memory. They're not the same thing, and using RAG for memory is why your agents keep forgetting important context. Let's understand the fundamental difference.

## The Core Problem

When building AI agents, developers often treat memory as just another retrieval problem. They store conversations in a vector database, embed queries, and hope semantic search will surface the right context.

**This approach fails because memory isn't about finding similar text—it's about understanding relationships, temporal context, and user state over time.**

## Documents vs Memories in Supermemory

Supermemory makes a clear distinction between these two concepts:

### Documents: Raw Knowledge
Documents are the raw content you send to Supermemory—PDFs, web pages, text files. They represent static knowledge that doesn't change based on who's accessing it.

**Characteristics:**
- **Stateless**: A document about Python programming is the same for everyone
- **Unversioned**: Content doesn't track changes over time
- **Universal**: Not linked to specific users or entities
- **Searchable**: Perfect for semantic similarity search

**Use Cases:**
- Company knowledge bases
- Technical documentation
- Research papers
- General reference material

### Memories: Contextual Understanding
Memories are the insights, preferences, and relationships extracted from documents and conversations. They're tied to specific users or entities and evolve over time.

**Characteristics:**
- **Stateful**: "User prefers dark mode" is specific to that user
- **Temporal**: Tracks when facts became true or invalid
- **Personal**: Linked to users, sessions, or entities
- **Relational**: Understands connections between facts

**Use Cases:**
- User preferences and history
- Conversation context
- Personal facts and relationships
- Behavioral patterns

## Why RAG Fails as Memory

Let's look at a real scenario that illustrates the problem:

<Tabs>
  <Tab title="The Scenario">
    ```
    Day 1: "I love Adidas sneakers"
    Day 30: "My Adidas broke after a month, terrible quality"
    Day 31: "I'm switching to Puma"
    Day 45: "What sneakers should I buy?"
    ```
  </Tab>

  <Tab title="RAG Approach (Wrong)">
    ```python
    # RAG sees these as isolated embeddings
    query = "What sneakers should I buy?"

    # Semantic search finds closest match
    result = vector_search(query)
    # Returns: "I love Adidas sneakers" (highest similarity)

    # Agent recommends Adidas 🤦
    ```

    **Problem**: RAG finds the most semantically similar text but misses the temporal progression and causal relationships.
  </Tab>

  <Tab title="Memory Approach (Right)">
    ```python
    # Supermemory understands temporal context
    query = "What sneakers should I buy?"

    # Memory retrieval considers:
    # 1. Temporal validity (Adidas preference is outdated)
    # 2. Causal relationships (broke → disappointment → switch)
    # 3. Current state (now prefers Puma)

    # Agent correctly recommends Puma ✅
    ```

    **Solution**: Memory systems track when facts become invalid and understand causal chains.
  </Tab>
</Tabs>

## The Technical Difference

### RAG: Semantic Similarity
```
Query → Embedding → Vector Search → Top-K Results → LLM
```

RAG excels at finding information that's semantically similar to your query. It's stateless—each query is independent.

### Memory: Contextual Graph
```
Query → Entity Recognition → Graph Traversal → Temporal Filtering → Context Assembly → LLM
```

Memory systems build a knowledge graph that understands:
- **Entities**: Users, products, concepts
- **Relationships**: Preferences, ownership, causality
- **Temporal Context**: When facts were true
- **Invalidation**: When facts became outdated

## When to Use Each

<CardGroup cols={2}>
  <Card title="Use RAG For" icon="search">
    - Static documentation
    - Knowledge bases
    - Research queries
    - General Q&A
    - Content that doesn't change per user
  </Card>

  <Card title="Use Memory For" icon="brain">
    - User preferences
    - Conversation history
    - Personal facts
    - Behavioral patterns
    - Anything that evolves over time
  </Card>
</CardGroup>

## Real-World Examples

### E-commerce Assistant

<Tabs>
  <Tab title="RAG Component">
    Stores product catalogs, specifications, reviews

    ```python
    # Good for RAG
    "What are the specs of iPhone 15?"
    "Compare Nike and Adidas running shoes"
    "Show me waterproof jackets"
    ```
  </Tab>

  <Tab title="Memory Component">
    Tracks user preferences, purchase history, interactions

    ```python
    # Needs Memory
    "What size do I usually wear?"
    "Did I like my last purchase?"
    "What's my budget preference?"
    ```
  </Tab>
</Tabs>

### Customer Support Bot

<Tabs>
  <Tab title="RAG Component">
    FAQ documents, troubleshooting guides, policies

    ```python
    # Good for RAG
    "How do I reset my password?"
    "What's your return policy?"
    "Troubleshooting WiFi issues"
    ```
  </Tab>

  <Tab title="Memory Component">
    Previous issues, user account details, conversation context

    ```python
    # Needs Memory
    "Is my issue from last week resolved?"
    "What plan am I on?"
    "You were helping me with..."
    ```
  </Tab>
</Tabs>

## How Supermemory Handles Both

Supermemory provides a unified platform that correctly handles both patterns:

### 1. Document Storage (RAG)
```python
# Add a document for RAG-style retrieval
client.memories.add(
    content="iPhone 15 has a 48MP camera and A17 Pro chip",
    # No user association - universal knowledge
)
```

### 2. Memory Creation
```python
# Add a user-specific memory
client.memories.add(
    content="User prefers Android over iOS",
    container_tags=["user_123"],  # User-specific
    metadata={
        "type": "preference",
        "confidence": "high"
    }
)
```

### 3. Hybrid Retrieval
```python
# Search combines both approaches
results = client.memories.search(
    query="What phone should I recommend?",
    container_tags=["user_123"],  # Gets user memories
    # Also searches general knowledge
)

# Results include:
# - User's Android preference (memory)
# - Latest Android phone specs (documents)
```

## The Bottom Line

<Note>
**Key Insight**: RAG answers "What do I know?" while Memory answers "What do I remember about you?"
</Note>

Stop treating memory like a retrieval problem. Your agents need both:
- **RAG** for accessing knowledge
- **Memory** for understanding users

Supermemory provides both capabilities in a unified platform, ensuring your agents have the right context at the right time.
