Hi Louise,

Your plant is a succulentLearn the definition of a succulent plant and why they are called a "fat plant." called Crassula “Baby’s Necklace.”  Some other names are Jade Necklace or Worm Plant.

Crassula “Baby’s Necklace”

It is really easy to care for and an added plus is that they gets small white flowers during the late spring and early summer. If you provide really bright lightVery few houseplants should be placed in direct sun. High light refers only to bright indirect light since direct sun often burns the leaves of indoor houseplants. An area that is too hot and dry encourages Spider Mites and causes blooms to quickly fade. A northern exposure really doesn't provide enough light for high light plants. These plants need to be placed directly in front of an east-facing window, within 1-3 feet of a west-facing window, and within 5 ft. of a south facing window. A high light area has over 300 ft. candles of light., the leaves take on a pale reddish color, especially the leaf edges. here are some care tips:

Light: bright indirect lightVery few houseplants should be placed in direct sun. High light refers only to bright indirect light since direct sun often burns the leaves of indoor houseplants. An area that is too hot and dry encourages Spider Mites and causes blooms to quickly fade. A northern exposure really doesn't provide enough light for high light plants. These plants need to be placed directly in front of an east-facing window, within 1-3 feet of a west-facing window, and within 5 ft. of a south facing window. A high light area has over 300 ft. candles of light.. Direct sun only in the morning.

Water: Water well, until the excess water comes out the drip holes in the bottom of the pot. Never allow the water to sit in the excess water. Do not water again until the soil has practically  dried out. During the winter water even less. This plant is very drought resistant and can easily handle lack of water, but develops root rot when over watered.

fertilizerPlants need fertilizer only when they are actively growing. Slow growing plants in low light require very little plant food. Too much fertilizer is worse than not enough. Most plants prefer a water soluble plant food at 1/2 the recommended strength. Plants that are in bloom or dormant should not be fertilized. Houseplant food contains nitrogen (N), phosphorus (P), and potassium (K). A fertilizer containing these elements in equal proportion is considered a balanced plant food. Nitrogen helps in photosynthesis and encourages the growth of leaves and stems. Potassium and phosphorus also help in photosynthesis and aid in root and flower development. Most fertilizers have trace elements of other minerals that are lacking in the soil but are necessary for good plant growth. Fertilizers have a high salt content. If a plant is not producing new leaves and doesn’t absorb the fertilizer, salts build up in the soil. These salts can burn the roots, discolor the leaves, and cause new growth to be small.  : Feed after you have watered and never when the soil is very dry. Use a liquid plant food that has been diluted to 1/2 the recommended strength. Fertilize every 2 weeks from the end of June to the end of September. Feed monthly in April, May, & June. Never feed from October through March.

Temperature: This plant likes warm temperatures between 65°-75°F (18.3°-23.9°C). Temperatures below 50°F (10°C) can damage the leaves.

propagationLearn how to propagate plants by plant division at https://www.houseplant411.com/glossary: Propagate using leaf and Stem CuttingsLearn how to propagate plants using stem cuttings, leaf cuttings, cane cuttings, and branch cuttings.. Be sure to allow the cuttings to sit out for 24 hours before planting them so the cut ends can dry out. This prevents root rot when you plant them.

Here is a link to where you can purchase one on Amazon. Also some links to other succulentLearn the definition of a succulent plant and why they are called a "fat plant."s you might like.

Let me know if you need more help.