There is a difference and it makes a difference!
Blending is a simpler task than segmenting so you will start with blending
Blending is stringing together individual sounds to make a word. (ex. Teacher says /p/ /a/ /t/......child responds "pat")
Segmenting is breaking a word into separate sounds. (ex. Teacher says "dog" and asks student to tell her the sounds in the word. Student responds /d/ /o/ /g/)
In the preceding blogs you will find sites that give some great ideas for fun and interesting activities for practicing blending and segmenting.
You can also find blending and segmenting activities at this link: