# Concepts

- [Dynamic contextual variables](/recommendations-and-merchandising/concepts/dynamic-contextual-variables.md)
- [Datasets and fields](/recommendations-and-merchandising/concepts/datasets-and-fields.md): AB Tasty Recos and Merch uses datasets and fields to define the data model and interact with.
- [Enriched fields](/recommendations-and-merchandising/concepts/datasets-and-fields/enriched-fields.md)
- [Calculated fields](/recommendations-and-merchandising/concepts/datasets-and-fields/calculated-fields.md)
- [Strategies](/recommendations-and-merchandising/concepts/strategies.md)
- [Placement: where strategies are displayed](/recommendations-and-merchandising/concepts/strategies/placement-where-strategies-are-displayed.md)
- [E-merchandising strategy](/recommendations-and-merchandising/concepts/strategies/e-merchandising-strategy.md)
- [Recommendation Strategies](/recommendations-and-merchandising/concepts/strategies/recommendation-strategies.md): With Recommendations & Merchandising (R\&M), you can anticipate visitor needs by suggesting the products that are most likely to convert. Based on onsite behavior (products viewed, purchased, or added
- [Rules](/recommendations-and-merchandising/concepts/strategies/rules.md)
- [Presets (default algorithms)](/recommendations-and-merchandising/concepts/strategies/rules/presets-default-algorithms.md)
- [Co-occurrence](/recommendations-and-merchandising/concepts/strategies/rules/presets-default-algorithms/co-occurrence.md)
- [TF-IDF (Term Frequency – Inverse Document Frequency)](/recommendations-and-merchandising/concepts/strategies/rules/presets-default-algorithms/tf-idf-term-frequency-inverse-document-frequency.md)
- [Semantic Similarity](/recommendations-and-merchandising/concepts/strategies/rules/presets-default-algorithms/semantic-similarity.md)
- [Custom Rules](/recommendations-and-merchandising/concepts/strategies/rules/custom-rules.md)
- [Exceptions & Fallback](/recommendations-and-merchandising/concepts/strategies/rules/exceptions-and-fallback.md)
- [Ranking blocks](/recommendations-and-merchandising/concepts/strategies/ranking-blocks.md)
- [Consent Options](/recommendations-and-merchandising/concepts/consent-options.md)
- [How Merchandising Works](/recommendations-and-merchandising/concepts/how-merchandising-works.md)
