Help me to understand the concept of Svalakshan & Savikalpaka jnana intuitively

I've found this phrase- > Buddhist logic school of Dignāga and Dharmakīrti, which flourished in medieval Kashmir. According to this school, the foundation of knowledge is a series of momentary and discrete perceptual data (svalakshana). There are no grounds in those data for the recognitions of any enduring entities through ostensible cognitions utilizing linguistic or conceptual interpretation (savikalpaka jnāna). But I'm unable to intuitively understand the meaning of Svalakshanam & savikalpaka jnana clearly. Can anyone help?