The TAJR335M004RNJ: This is a molded tantalum chip from the TAJ series, 3.3 µF at 4 V with ±20% tolerance — a general-purpose decoupling cap for low-voltage rails on a surface-mount board. The 0805 case (2.05 mm x 1.30 mm footprint) is a standard size — easy to hand-place or reflow, and the molded body gives better mechanical stability than a conformal-coated chip when the board flexes.
The 20 Ohm ESR is on the high side for a 3.3 µF tantalum — at 100 kHz the impedance is dominated by that resistance, so this cap is better suited for bulk decoupling or filtering rather than high-frequency bypass where a ceramic would beat it.