A conventional kriti typically contain three parts: The charanam usually borrows patterns from the anupallavi.
Other krithis, particularly some of Oothukkadu Venkata Kavi and Muthuswami Dikshitar's compositions, are intentionally composed without an annupallavi, where the verse after the pallavi is called the samashti charanam.
Still others have some more sāhityā at the end of the charaṇam, set in madhyamakāla (few lines within a song that are sung faster than the rest of it).
[1] There are krithi's, such as Thyagaraja's Enduku Nirdhaya that have no annupallavi but many short charanams.
One of the greatest explorers of the krti form was Oottukkadu Venkata Kavi (1700–1765), who has created numerous varieties within this form, often with innovations in contrasting speeds, gaits (gatis) and lyrical variation (sahitya-sangatis), sectional partitioning and singular blending of rhythmic syllables and lyrics.