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It's time to introduce our sixth basic TiddlyWiki concept: the filter.
TiddlyWiki filters are a lightweight query language used primarily to select tiddlers (they have a few other tricks up their sleeve, like doing math). If you're familiar with Excel or another spreadsheet application, TiddlyWiki filters are kind of like formulas – while you could have a useful wiki without filters, filters provide a kind of general-purpose glue that lets you avoid a lot of manual work.
You can do ad-hoc searches with filters. You can also use them to embed dynamic lists of tiddlers or content into other tiddlers. Like Excel does with formulas, TiddlyWiki is constantly checking and recalculating the contents of these lists, so as soon as you create or change a tiddler that matches, the contents of your list will update. This is where the real magic of TiddlyWiki starts to show up.